Bug 1986562: check buildConfig spec LastTriggeredImageID is empty
Bug 1986562: check buildConfig spec LastTriggeredImageID is empty

After the last PullRequest regarding this bug, we are already checking
that correct value is in LastTriggeredImageID field of BuildConfig
status.
Now, since openshift-apiserver changes have been merged, we can also
check that same spec field is actually empty and not filled.

akram/origin,mfojtik/origin,deads2k/origin,csrwng/origin,akram/origin,JacobTanenbaum/origin,JacobTanenbaum/origin,bparees/origin,mfojtik/origin,openshift/origin,csrwng/origin,gabemontero/origin,soltysh/origin,soltysh/origin,hroyrh/origin,akram/origin,mahak/origin,jsafrane/origin,sallyom/origin,JacobTanenbaum/origin,deads2k/origin,sallyom/origin,soltysh/origin,csrwng/origin,jsafrane/origin,mahak/origin,gabemontero/origin,hroyrh/origin,bparees/origin,hroyrh/origin,mahak/origin,bparees/origin,mfojtik/origin,gabemontero/origin,openshift/origin,openshift/origin,deads2k/origin,jsafrane/origin,sallyom/origin