New net_infrastructure "bigip_pool" module to support F5 load balancers

The "bigip_pool" module allows management of F5 BIG-IP LTM pools. It enforces both presence and absence of IP:port tuples in a pool. It is indempotent and also supports the "--check" option.

Behind the scenes, this module uses the F5 provided "bigsuds" Python library. This library can be downloaded from http://devcentral.f5.com. Due to this dependency and the lack of its presence in PyPi, I recommend running this as a "local_action:" in your playbook and installing the bigsuds Python module on your ansible server.