Error creating snatpool
Error creating snatpool

Issues:
Fixes #97

Problem: Creating a snat pool genereates an exception from BIG-IP REST
interface.

Analysis: An incorrect snat pool name is used when creating the snat pool
The name should be the snat pool name as defined in snat_info['pool_name'].
Changed the create to use this instead of index_snat_name.

Tests:

F5Networks/f5-openstack-agent,richbrowne/f5-openstack-agent,F5Networks/f5-openstack-agent,richbrowne/f5-openstack-agent,F5Networks/f5-openstack-agent,richbrowne/f5-openstack-agent