Changed the REQUIRE line to comply with the FreeBSD handbook

The REQUIRE should be LOGIN, not DAEMON, per the FreeBSD
Porter's handbook, in the FreeBSD init script. This is because sickbeard runs as a non-root user and
isn't part of the base system. Removed sabnzbd from the REQUIRE as well
since sabnzbd is not required for sickbeard to start and so should not
be listed in the REQUIRE line
Added additional rc variables to the FreeBSD init script

Added rc variables to allow specification of the Sick Beard host, port,
web interface username, and web interface password in /etc/rc.conf so
that users don't have to modify the init script to change these values.
This was done because user's shouldn't be modifying the init script
since init scripts are typically installed by the package and are
overwritten with each update. This changes allows Sick Beard to be
safely packaged into a port when the day comes that it's ready for that.
Removed sickbeard_flags reference from command_args variable

Modified the FreeBSD init script by removing the "${sickbeard_flags}"
reference from command_args because, per the FreeBSD Porter's handbook,
the flags variable should never be part of command_args. This is because
if the flags variable is defined it is added to the command
automatically by rc(8) when the init script is run.

Unfortunately we currently can't define the flags variable because it
gets added as a flag to /usr/sbin/daemon, not SickBeard.py
Cleaned up the output of the status function of the FreeBSD init script

The "status" command showed the ps usage information in the event it was
run when Sick Beard wasn't running. This is because no PID is provided
to "ps -p" in that instance. I redirected STDERR of the "ps -p" command
to /dev/null to resovle the bug
Merge pull request #772 from nixalot/freebsd_init_update

Update the FreeBSD init script to comply with the standards in the FreeBSD Porter's Handbook