Change network status cell values to Title case

All resources status values are presented as Title case except
networks's, appearing as Upper case.
I changed the network status values presentation to match
other resources, in order to maintain consistency.

Change-Id: I45e9dc18a8290745ae56dea82b5ccaff392822da
Closes-Bug: #1391482
Merge "Change network status cell values to Title case"
Merge branch 'master' of https://github.com/openstack/horizon