Remove all stalled Makefiles in net category.

Approved and reviewed by:       marcus

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

- Update to 3.1 (1790)

PR:             ports/60923
Submitted by:   Yuriy N. Shkandybin <jura@netams.com> (maintainer)

- Update to version netams-3.1(1770)
- Unbreak build on 5.x
- Pet portlint

PR:             60543
Submitted by:   maintainer

Mark as broken on 5.x due to compile problems (possibly related to
gcc3.3 import although it's hard to say).  Notified maintainer.

Update based on new version netams-3.1.1563

PR:             52608
Submitted by:   "Yuriy N. Shkandybin" <jura@happychance.com>

NeTAMS - Network Traffic Accounting and Monitoring Software

        NeTAMS is a Network Traffic Accounting and Monitoring Software.
        It runs as a daemon under FreeBSD and Linux operating systems.
        Collects an IP traffic information flowing via your PC/UNIX
        or Cisco router, filters it, aggregates, stores onto HASH/SQL
        database, and makes SMTP/HTML reports to site administrator.
        Anoter features are flexible policy targets, firewalling,
        access control, quotas, scheduler and much much more.

PR:             ports/46777
Submitted by:   Yuriy N. Shkandybin <jura@happychance.com>