[RFE] Added support for vmware vcenter in packstack

rhbz#1061372

(cherry picked from commit 7b91c78a2d03b6cee25e61a6850630884481e5e9)

Change-Id: I1ca3b0c3198eea898a6ef7b3021aedd646b256cb
Merge "[RFE] Added support for vmware vcenter in packstack" into havana