This patch adds support for the server_port module. It
additionally updates the documentation in the module for
it.
The changes were tested in the f5-ansible repository to
ensure no breaking changes were made. This argument allows
modules to be used on BIG-IPs that are listening on
non-standard ports.
As is done in other ansible modules, this adds the __main__ check
to the module so that the module code itself can be used as a library.
For instance, when testing the code.
The device option was already implemented but omitted from docs and allowed
choices. With the addition of device, a devices failover_state can be
determined.
