Fixed root disk resize on deploy for RBD.

Signed-off-by: Wido den Hollander <wido@widodh.nl>
(cherry picked from commit 3a52a83faeaa72a8488b2db1253fef6d3308d708)
Signed-off-by: Rohit Yadav <rohit.yadav@shapeblue.com>

Conflicts:
	plugins/hypervisors/kvm/src/com/cloud/hypervisor/kvm/storage/LibvirtStorageAdaptor.java