tests: don't lock fd 1 (stdout), don't use /proc/$$/fd

tests: don't lock fd 1 (stdout), don't use /proc/$$/fd

On debian-kfreebsd we've locked stdout which messed up our test logs. Using
/proc/*/fd/ is not portable. Even ts_init's test for "/proc/self/fd"
does not help because /proc/*/fd behaves strange here:

  $ ls -l  /proc/$$/fd
  lr--r--r-- 1 rudi user 0 Mar  6 23:11 /proc/2194/fd -> unknown
  $ file /proc/$$/fd
  /proc/2194/fd: broken symbolic link to `unknown'
  ## wtf?
  $ test -d /proc/$$/fd; echo $?
  0
  $ ls -l  /proc/$$/fd/
  ls: cannot access /proc/2194/fd/: No such file or directory
  ## but
  $ ls -l  /proc/self/fd/
  total 0
  cr-xr-xr-x 1 root root 0, 3 Mar  6 19:39 0
  cr-xr-xr-x 1 root root 0, 4 Mar  6 19:39 1
  cr-xr-xr-x 1 root root 0, 5 Mar  6 19:39 2
  cr-xr-xr-x 1 root root 0, 6 Mar  6 19:39 3

This is how this patch changes the test output:

[...]
         blkid: partitions probing: [06] sgi                  ... OK
         blkid: partitions probing: [07] sun                  ... OK
         blkid: partitions probing                            ... OK (all 7 sub-tests PASSED)
-ls: cannot access /proc/66215/fd/: No such file or directory
+        blkid: mbr-wholedisk                                 ... SKIPPED (missing scsi_debug module (dry-run))
         blkid: MD raid0 (whole-disks)                        ... SKIPPED (losetup not found)
         blkid: MD raid1 (last partition)                     ... SKIPPED (missing in PATH: mdadm)
         blkid: MD raid1 (whole-disks)                        ... SKIPPED (losetup not found)
@@ -343,11 +343,11 @@
         dmesg: facilities                                    ... SKIPPED (test_dmesg not found)
         dmesg: indentation                                   ... SKIPPED (test_dmesg not found)
         eject: umount                                        ... SKIPPED (eject not found)
-ls: cannot access /proc/69561/fd/: No such file or directory
-ls: cannot access /proc/69609/fd/: No such file or directory
+        fdisk: align 512/4K                                  ... SKIPPED (missing scsi_debug module (dry-run))
+        fdisk: align 512/4K +alignment_offset                ... SKIPPED (missing scsi_debug module (dry-run))
         fdisk: align 512/4K +MD                              ... SKIPPED (missing in PATH: mdadm)
         fdisk: align 512/512                                 ... SKIPPED (losetup not found)
[...]

Signed-off-by: Ruediger Meier <ruediger.meier@ga-group.nl>