Re: [Libvir] [PATCH] Add new testing framework and the first test to use it.

A week or so ago, I read a bug report on this list with a simple reproducer + fix that was just begging for a test suite addition. This change adds framework to make that easy, and adds the first test. I uncovered problems in tests/Makefile.am along the way and just posted a patch for that. This adds most of a portable (bourne-shell-based) test framework that also provides for convenient isolation of individual tests (so we can easily parallelize them without worrying one will tromp on files of another). In a couple years when running "make check" runs hundreds of tests, you'll definitely want them to run in parallel. The mktempd script is not new. I first used it in coreutils and parted, but removed it from coreutils after that package acquired its own C-based implementation. test-lib.sh is from coreutils, but was inspired by the file by the same name in git.git's own t/ (tests) directory.