Modernize, improve and extend tests `subobj*.test'.

Modernize, improve and extend tests `subobj*.test'.

* tests/subobjname.test:  Add trailing `:' command.
* tests/subobj.test: Make grepping of `Makefile.in' stricter.
Escape literal dots in grep regexps.
* tests/subobj2.test:  Add trailing `:' command.  Do not use the
unportable fgrep option `-e'.
* tests/subobj3.test: Add trailing `:' command.
(configure.in): Use proper m4 quoting, and avoid obsolescent
constructs.
* tests/subobj8.test: Likewise.  Also, enable `errexit' shell
flag, with related changes
* tests/subobj4.test: Likewise.  Also, make grepping of
`Makefile.in' stricter.
* tests/subobj5.test: Add trailing `:' command.  Move setting of
`errexit' shell flag earlier in the script (just after inclusion
of ./defs).
(configure.in): Use the stub created by `./defs', rather than
writing it from scratch, and avoid obsolescent constructs.
* tests/subobj6.test: Add trailing `:' command.  Move setting of
`errexit' shell flag earlier in the script (just after inclusion
of ./defs).  Do not create useless dummy ac-init file `f'.
* tests/subobj7.test: Do not create useless dummy ac-init file
`f'.
(configure.in): Use the stub created by `./defs', rather than
writing it from scratch, and avoid obsolescent constructs.
* tests/subobj9.test: Move setting of `errexit' shell flag earlier
in the script (just after inclusion of ./defs).  Fail the test if
`make distcheck' fails.  Ensure verbose printing of captured make
stdout.  Avoid uselsss fork by doing simple grep instead of using
test -n "`COMMAND | grep ...`".
(configure.in): Normalize the call to AC_INIT w.r.t. other tests.
(Makefile.am): Explicitly mark target "print" as phony.
* tests/subobj10.test: Removed duplicated call to `set -e'.  Add
trailing `:' command.
(configure.in): Normalize the call to AC_INIT w.r.t. other tests.