* Use the FAPL that was created earlier in the test (and delete an unused
variable). This allows 'make check-vfd' to pass with --enable-mirror-vfd.
* Check for testing directory before creating, to avoid warning from bash.
Clean out .libs directory before re-using it (after a failed test), to
remove any files generated by libtool.
* Committing clang-format changes
* Increment error count on failed file open and skip tests for VFDs that need
modified filenames.
* Skip the mirror VFD for 'make check-vfd' - the mirror VFD requires networking
configuration parameters and can't be provided for an automated test that
is configured with an environment variable.
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