don't expect the engine to be up right after starting it's guest

- there were states which went directly from Down to Up not giving
the engine enough time to start which lead agent to go to BadHealth
state, this is wrong and we should give the guest and engine
some time to settle

Change-Id: Ie68360fe883d5d05db4974f73381da5386453845
Bug-Url: https://bugzilla.redhat.com/show_bug.cgi?id=1130173
Signed-off-by: Jiri Moskovcak <jmoskovc@redhat.com>