core : Upgrading a hypervisor automatically puts it into an Up state

When upgrading a hypervisor via the admin portal, once
the install is finished the hypervisor returns (or tries
to return) to an Up state

Change-Id: Ib94ba543b347aab4eafe326e7fce84aac163be25
Bug-Url: https://bugzilla.redhat.com/1073070
Signed-off-by: Ravi Nori <rnori@redhat.com>