Added Oracle Linux distribution support

Enabled devstack to support oracle Linux Server

Change-Id: I1749cd3c7756a9903d2a0b0ab19606f87a4937d4
Merge "Added Oracle Linux distribution support"
Merge commit 'refs/changes/83/86083/2' of git://gold.eng.hq.xensource.com/git/github/openstack-dev/devstack into tmpbranch
Merge commit 'refs/changes/74/106774/2' of git://gold.eng.hq.xensource.com/git/github/openstack-dev/devstack into tmpbranch
Merge commit 'refs/changes/75/106775/1' of git://gold.eng.hq.xensource.com/git/github/openstack-dev/devstack into tmpbranch
Merge commit 'refs/changes/45/107345/1' of git://gold.eng.hq.xensource.com/git/github/openstack-dev/devstack into tmpbranch