Storage provision fix
Storage provision fix

Closes-Bug: #1531637
Closes-Bug: #1531699
Closes-Bug: #1531705
Fixed issue in setting the host entry in /etc/hosts
Fixed issue during unconfigure when restoring glance configuration
Added disk partition reset to avoid issue during zap in case the
   disk was configured with LVM previously.

Change-Id: I01f108247f529a2236f4d681a956e0b327e4fc1c

Juniper/contrail-provisioning,Juniper/contrail-provisioning