Fix gpfs driver volume_driver path

GPFS driver was moved.

Change-Id: I0c01cd24805a3ba02fe4c97b874a01524c82cb82
Closes-Bug: 1284491
Update index.html pages for Icehouse release

Add Icehouse as release
docs.openstack.org/index.html now points to Icehouse information

Change-Id: Id1ebffcfaebdac02931c294091498214fd5ed6a9
Merge "Fix gpfs driver volume_driver path"
Merge "Update index.html pages for Icehouse release"