Early die if on image gets killed
Early die if on image gets killed

The Images reaches the 'killed' status only on an
unrecoverable error, any further wait is in vain.

The wait method will raise an exception on the killed state.

Change-Id: I392674c872d7f2354a2a2d338e14630b211cf12b

JioCloud/tempest-lib,afaheem88/tempest-lib,mtreinish/tempest-lib,cneill/tempest-lib,varunarya10/tempest-lib,sorenh/tempest-lib