Add gophercloud to the list of SDKs
Add gophercloud to the list of SDKs

Also, Split SDK list into openstack and multi-cloud: OpenStack specific
SDKs and multi-cloud abstraction SDKs are different beasts. Let's group
them for clarity. Also, reindented because tracking div opens and closes
was confusing since some of the divs didn't indent.

Change-Id: I2df85822ede469589e9a56ca3772828e576e549c

openstack/api-site,openstack/api-site,openstack/api-site,openstack/api-site