tests: factor out common awk code

Factor out awk code used in several tests to match.awk.

* tests/match.awk: New file.
* tests/Makefile.am (EXTRA_DIST): Add it.
* tests/caps.awk: Use it.
* tests/getdents.awk: Likewise.
* tests/getrandom.awk: Likewise.
* tests/select.awk: Likewise.
* tests/sigaction.awk: Likewise.
* tests/init.sh (match_awk): Use gawk not awk.  Define AWKPATH.
* tests/getdents.test: Likewise.
9 files changed