Remove non staged ports without pending PR from net-im and net-mgmt

Modernize LIB_DEPENDS

With hat:	portmgr

Remove indefinite articles and trailing periods from COMMENT, plus minor
COMMENT typos and surrounding whitespace fixes. A few Makefiles where not
included as they contain Latin-1 characters that break the Phabricator
workflow. Category N.

CR:		D307
Approved by:	portmgr (bapt)

Add NO_STAGE all over the place in preparation for the staging support (cat:
net-mgmt)

- Add LDFLAGS to CONFIGURE_ENV and MAKE_ENV (as it was done with LDFLAGS)
- Fix all ports that add {CPP,LD}FLAGS to *_ENV to modify flags instead

PR:             157936
Submitted by:   myself
Exp-runs by:    pav
Approved by:    pav

- Track dependencies after databases/gdbm update

- Get Rid MD5 support

For ports maintained by ports@FreeBSD.org, remove names and/or
e-mail addresses from the pkg-descr file that could reasonably
be mistaken for maintainer contact information in order to avoid
confusion on the part of users looking for support. As a pleasant
side effect this also avoids confusion and/or frustration for people
who are no longer maintaining those ports.

Reset markp due to lack of response to email and maintainer-timeouts.

Hat:    portmgr

SHA256ify

Approved by: krion@

SIZEify (maintainer timeout)

Say hello to the new "net-mgmt" category.  There are probably more
ports that belong here than the ones I have identified and moved in
this, first, pass.

Approved in principle by: marcus