Prior to this change, the assumption in all shell and Python scripts was
that the Bash interpreter would always be available at `/bin/bash`, and
Python would always be available at `/usr/bin/python`. However, on a VM
running FreeBSD, installing bash and python using the pkg command
installs them under /usr/local/bin.
This change updates the paths to use /usr/bin/env in the shebang. While
this is not a standard path either, it is more likely to be available at
this location.
This change also updates the find command in common_infra.sh to use
`-perm -+x` in lieu of `-executable`, which is not a condition defined
by POSIX. This allows running the tests on BSD.
Prior to this change, the tests were using the automake simple test
harness. The limitation was that for each set of test cases (e.g.
timezone tests), even if one test failed, it would report every test in
that set as failed. Migrating to TAP allows fine-grained reporting on
every single test case, and allows better investigation into checking
which individual tests failed.
This change also updates the timezone tests to explicitly mark the ones
that check when the timezone is Pacific Daylight Time as expected to
fail. It also updates the clock tests to improve the formatting of the
test case identifier.
nirenjan