Added CPU shares parameters
Added CPU shares parameters

Two new cpu_shares parameters were added, this adds the content.

Change-Id: I21887ff889ce2a02b572f910399dbe17806619bf
Closes-Bug: 1362838

openstack/openstack-manuals,openstack/openstack-manuals,Akasurde/openstack-manuals,AlekhyaMallina-Vedams/openstack-manuals,potsmaster/openstack-manuals,AlekhyaMallina-Vedams/openstack-manuals,potsmaster/openstack-manuals,kairoaraujo/openstack-manuals,Akasurde/openstack-manuals,openstack/openstack-manuals,AlekhyaMallina-Vedams/openstack-manuals,kairoaraujo/openstack-manuals,openstack/openstack-manuals