* tests/sample-test: Quote variables containing absolute build

* tests/sample-test: Quote variables containing absolute build
tree paths.  In the cleanup trap, make sure `cd' succeeds before
`chmod'ing and `rm'ing the temporary files.
* tests/chgrp/basic: Likewise.
* tests/chgrp/deref: Likewise.
* tests/chgrp/no-x: Likewise.
* tests/chgrp/posix-H: Likewise.
* tests/chgrp/recurse: Likewise.
* tests/chmod/c-option: Likewise.
* tests/chmod/equal-x: Likewise.
* tests/chmod/equals: Likewise.
* tests/chmod/inaccessible: Likewise.
* tests/chmod/no-x: Likewise.
* tests/chmod/octal: Likewise.
* tests/chmod/setgid: Likewise.
* tests/chmod/umask-x: Likewise.
* tests/chmod/usage: Likewise.
* tests/chown/basic: Likewise.
* tests/chown/deref: Likewise.
* tests/chown/separator: Likewise.
* tests/cp/acl: Likewise.
* tests/cp/backup-1: Likewise.
* tests/cp/backup-dir: Likewise.
* tests/cp/backup-is-src: Likewise.
* tests/cp/cp-HL: Likewise.
* tests/cp/cp-deref: Likewise.
* tests/cp/cp-i: Likewise.
* tests/cp/cp-mv-backup: Likewise.
* tests/cp/cp-parents: Likewise.
* tests/cp/deref-slink: Likewise.
* tests/cp/dir-rm-dest: Likewise.
* tests/cp/dir-slash: Likewise.
* tests/cp/dir-vs-file: Likewise.
* tests/cp/fail-perm: Likewise.
* tests/cp/into-self: Likewise.
* tests/cp/link: Likewise.
* tests/cp/link-no-deref: Likewise.
* tests/cp/link-preserve: Likewise.
* tests/cp/no-deref-link1: Likewise.
* tests/cp/no-deref-link2: Likewise.
* tests/cp/no-deref-link3: Likewise.
* tests/cp/perm: Likewise.
* tests/cp/preserve-2: Likewise.
* tests/cp/r-vs-symlink: Likewise.
* tests/cp/same-file: Likewise.
* tests/cp/slink-2-slink: Likewise.
* tests/cp/sparse: Likewise.
* tests/cp/special-bits: Likewise.
* tests/cp/src-base-dot: Likewise.
* tests/cp/symlink-slash: Likewise.
* tests/dd/not-rewound: Likewise.
* tests/dd/skip-seek2: Likewise.
* tests/dd/unblock-sync: Likewise.
* tests/du/2g: Likewise.
* tests/du/8gb: Likewise.
* tests/du/basic: Likewise.
* tests/du/deref: Likewise.
* tests/du/deref-args: Likewise.
* tests/du/exclude: Likewise.
* tests/du/fd-leak: Likewise.
* tests/du/hard-link: Likewise.
* tests/du/inaccessible-cwd: Likewise.
* tests/du/long-from-unreadable: Likewise.
* tests/du/long-sloop: Likewise.
* tests/du/no-deref: Likewise.
* tests/du/no-x: Likewise.
* tests/du/restore-wd: Likewise.
* tests/du/slash: Likewise.
* tests/du/slink: Likewise.
* tests/du/trailing-slash: Likewise.
* tests/du/two-args: Likewise.
* tests/fmt/long-line: Likewise.
* tests/install/basic-1: Likewise.
* tests/install/create-leading: Likewise.
* tests/install/d-slashdot: Likewise.
* tests/install/trap: Likewise.
* tests/ln/misc: Likewise.
* tests/ln/target-1: Likewise.
* tests/ls/color-dtype-dir: Likewise.
* tests/ls/dangle: Likewise.
* tests/ls/dired: Likewise.
* tests/ls/file-type: Likewise.
* tests/ls/follow-slink: Likewise.
* tests/ls/infloop: Likewise.
* tests/ls/inode: Likewise.
* tests/ls/m-option: Likewise.
* tests/ls/no-arg: Likewise.
* tests/ls/recursive: Likewise.
* tests/ls/rt-1: Likewise.
* tests/ls/stat-dtype: Likewise.
* tests/ls/stat-failed: Likewise.
* tests/ls/stat-vs-dirent: Likewise.
* tests/misc/cat-proc: Likewise.
* tests/misc/close-stdout: Likewise.
* tests/misc/csplit: Likewise.
* tests/misc/date-sec: Likewise.
* tests/misc/false-status: Likewise.
* tests/misc/head-c: Likewise.
* tests/misc/head-pos: Likewise.
* tests/misc/mknod: Likewise.
* tests/misc/nl: Likewise.
* tests/misc/nohup: Likewise.
* tests/misc/pathchk1: Likewise.
* tests/misc/printf: Likewise.
* tests/misc/printf-hex: Likewise.
* tests/misc/pwd-long: Likewise.
* tests/misc/shuf: Likewise.
* tests/misc/sort-rand: Likewise.
* tests/misc/split-a: Likewise.
* tests/misc/split-fail: Likewise.
* tests/misc/split-l: Likewise.
* tests/misc/stat-fmt: Likewise.
* tests/misc/tac-continue: Likewise.
* tests/misc/wc-files0: Likewise.
* tests/mkdir/concurrent-1: Likewise.
* tests/mkdir/p-1: Likewise.
* tests/mkdir/p-2: Likewise.
* tests/mkdir/p-3: Likewise.
* tests/mkdir/p-slashdot: Likewise.
* tests/mkdir/p-thru-slink: Likewise.
* tests/mkdir/p-v: Likewise.
* tests/mkdir/parents: Likewise.
* tests/mkdir/perm: Likewise.
* tests/mkdir/t-slash: Likewise.
* tests/mv/acl: Likewise.
* tests/mv/atomic: Likewise.
* tests/mv/backup-dir: Likewise.
* tests/mv/childproof: Likewise.
* tests/mv/diag: Likewise.
* tests/mv/dir-file: Likewise.
* tests/mv/dir2dir: Likewise.
* tests/mv/dup-source: Likewise.
* tests/mv/hard-2: Likewise.
* tests/mv/hard-3: Likewise.
* tests/mv/hard-4: Likewise.
* tests/mv/hard-link-1: Likewise.
* tests/mv/hard-verbose: Likewise.
* tests/mv/i-2: Likewise.
* tests/mv/i-3: Likewise.
* tests/mv/i-4: Likewise.
* tests/mv/i-5: Likewise.
* tests/mv/i-link-no: Likewise.
* tests/mv/into-self-4: Likewise.
* tests/mv/leak-fd: Likewise.
* tests/mv/mv-special-1: Likewise.
* tests/mv/no-target-dir: Likewise.
* tests/mv/part-fail: Likewise.
* tests/mv/part-hardlink: Likewise.
* tests/mv/part-rename: Likewise.
* tests/mv/part-symlink: Likewise.
* tests/mv/partition-perm: Likewise.
* tests/mv/perm-1: Likewise.
* tests/mv/reply-no: Likewise.
* tests/mv/trailing-slash: Likewise.
* tests/mv/update: Likewise.
* tests/od/od-N: Likewise.
* tests/od/x8: Likewise.
* tests/readlink/can-e: Likewise.
* tests/readlink/can-f: Likewise.
* tests/readlink/can-m: Likewise.
* tests/readlink/rl-1: Likewise.
* tests/rm/cycle: Likewise.
* tests/rm/dangling-symlink: Likewise.
* tests/rm/deep-1: Likewise.
* tests/rm/dir-no-w: Likewise.
* tests/rm/dir-nonrecur: Likewise.
* tests/rm/dot-rel: Likewise.
* tests/rm/empty-inacc: Likewise.
* tests/rm/f-1: Likewise.
* tests/rm/fail-2eperm: Likewise.
* tests/rm/hash: Likewise.
* tests/rm/i-1: Likewise.
* tests/rm/i-no-r: Likewise.
* tests/rm/ignorable: Likewise.
* tests/rm/inaccessible: Likewise.
* tests/rm/interactive-always: Likewise.
* tests/rm/interactive-once: Likewise.
* tests/rm/ir-1: Likewise.
* tests/rm/isatty: Likewise.
* tests/rm/no-give-up: Likewise.
* tests/rm/r-1: Likewise.
* tests/rm/r-2: Likewise.
* tests/rm/r-3: Likewise.
* tests/rm/r-4: Likewise.
* tests/rm/readdir-bug: Likewise.
* tests/rm/rm1: Likewise.
* tests/rm/rm2: Likewise.
* tests/rm/rm3: Likewise.
* tests/rm/rm4: Likewise.
* tests/rm/rm5: Likewise.
* tests/rm/sunos-1: Likewise.
* tests/rm/unread2: Likewise.
* tests/rm/unread3: Likewise.
* tests/rmdir/fail-perm: Likewise.
* tests/rmdir/t-slash: Likewise.
* tests/shred/exact: Likewise.
* tests/shred/remove: Likewise.
* tests/sum/sysv: Likewise.
* tests/tail-2/append-only: Likewise.
* tests/tail-2/assert: Likewise.
* tests/tail-2/assert-2: Likewise.
* tests/tail-2/big-4gb: Likewise.
* tests/tail-2/fflush: Likewise.
* tests/tail-2/infloop-1: Likewise.
* tests/tail-2/proc-ksyms: Likewise.
* tests/tail-2/start-middle: Likewise.
* tests/tail-2/tail-n0f: Likewise.
* tests/tee/basic: Likewise.
* tests/tee/dash: Likewise.
* tests/touch/fail-diag: Likewise.
* tests/touch/no-create-missing: Likewise.
* tests/touch/not-owner: Likewise.
* tests/touch/obsolescent: Likewise.
* tests/touch/read-only: Likewise.
* tests/touch/relative: Likewise.