Merge ^/user/ngie/release-pkg-fix-tests to unbreak how test files are installed
after r298107

Summary of changes:

• Replace all instances of FILES/TESTS with ${PACKAGE}FILES. This ensures that namespacing is kept with FILES appropriately, and that this shouldn't need to be repeated if the namespace changes -- only the definition of PACKAGE needs to be changed
• Allow PACKAGE to be overridden by callers instead of forcing it to always be tests. In the event we get to the point where things can be split up enough in the base system, it would make more sense to group the tests with the blocks they're a part of, e.g. byacc with byacc-tests, etc
• Remove PACKAGE definitions where possible, i.e. where FILES wasn't used previously.
• Remove unnecessary TESTSPACKAGE definitions; this has been elided into bsd.tests.mk
• Remove unnecessary BINDIRs used previously with ${PACKAGE}FILES; ${PACKAGE}FILESDIR is now automatically defined in bsd.test.mk.
• Fix installation of files under data/ subdirectories in lib/libc/tests/hash and lib/libc/tests/net/getaddrinfo
• Remove unnecessary .include <bsd.own.mk>s (some opportunistic cleanup)

Document the proposed changes in share/examples/tests/tests/... via examples
so it's clear that ${PACKAGES}FILES is the suggested way forward in terms of
replacing FILES. share/mk/bsd.README didn't seem like the appropriate method
of communicating that info.

MFC after: never probably
X-MFC with: r298107
PR: 209114
Relnotes: yes
Tested with: buildworld, installworld, checkworld; buildworld, packageworld
Sponsored by: EMC / Isilon Storage Division