Adding floating ip pool to node groups details for cluster

Adding display of floating_ip_pool to the node groups tab
on the cluster details page.  It will only show up if
the floating_ip_pool is non-null.

Fixes:  bug #1257284

Change-Id: I96db789f64b0a32f186c61d0ddfb90a41412fd26
Merge "Adding floating ip pool to node groups details for cluster"