Remove # $FreeBSD$ from Makefiles.

Add PY_FLAVOR to Python module dependencies.

Sponsored by:	Absolight

Remove ${PORTSDIR}/ from dependencies, categories d, e, f, and g.

With hat:	portmgr
Sponsored by:	Absolight

Improve shebangfix framework

- Support multiple values in *_OLD_CMD, i.e. we can now fix both
"/usr/bin/python" and "/usr/bin/env python" at the same time
- Default *_OLD_CMD values are now always appended, so you don't need to specify
them in individual ports
- Add lua support (depends on USES=lua)
- Add more default values, such as "/usr/bin/env foo" for python, perl, bash,
ruby and lua
- Shebangfix now matches whole words, e.g. we will no longer (erroneously)
replace "/usr/bin/perl5.005" with "${perl_CMD}5.005" (but "/usr/bin/perl -tt" is
still (correctly) replaced with "${perl_CMD} -tt")

Note that *_OLD_CMD items containing spaces must now be quoted (e.g.
perl_OLD_CMD=/bin/perl /usr/bin/perl "/usr/bin/env perl")

Update shebangfix usage according to new rules in many ports:

- Remove *_OLD_CMD for patterns now replaced by default
- Quote custom *_OLD_CMD which contain spaces

Fix shebangfix usage in many ports (irrelevant to infrastructure change):

- Remove redundant SHEBANG_LANG (no need to duplicate default langs)
- Remove redundant *_CMD (such as
python_CMD=${LOCALBASE}/bin/python${PYTHON_VER} when USES=python is present)
- Never use *_OLD_CMD in REINPLACE_CMD matchers, these should always look for
exact string

Approved by:	portmgr (bapt)
Differential Revision:	D3756

Switch default python_CMD used by shebangfix to ${PYTHON_CMD} for ports
using python

PR:		201077
Reviewed by:	mat
With hat:	portmgr
Differential Revision:	https://reviews.freebsd.org/D2955

Update ports in the [bcd]* categories to not use GH_COMMIT.

With minor cleanups to make things simpler.

With hat:	portmgr
Sponsored by:	Absolight

Fix DEPENDS

Cleanup plist

- Convert ports from databases/ and deskutils/ to new USES=python

Approved by:	portmgr (implicit)

Add python version against which package was built into PKGNAME;
Fix secondary category.

Fix a typo.

Remove testing leftover.

New port: nagios-check_mongodb.
A Nagios plugin to check MongoDB status.