When overriding a payload image, skip the fast path check
When overriding a payload image, skip the fast path check

Payload images are expected to declare their manifests in their
top layer for efficiency and to prevent inherited manifests in
base layers from accidentally propagating. However, if the user
provides a custom image we should assume they may have layered
their changes on top of an existing image, and we should read
the whole image.

Also change the log message we print to make it clearer that this is
a special case

hroyrh/origin,ironcladlou/origin,sjug/origin,pecameron/origin,akram/origin,linzhaoming/origin,csrwng/origin,linzhaoming/origin,linzhaoming/origin,ingvagabund/origin,gabemontero/origin,tnozicka/origin,ingvagabund/origin,nak3/origin,enj/origin,coreydaley/origin,dinhxuanvu/origin,soltysh/origin,openshift/origin,mahak/origin,gabemontero/origin,mkumatag/origin,tnozicka/origin,jim-minter/origin,xiuwang/origin,mahak/origin,jsafrane/origin,nak3/origin,jeremyeder/origin,pweil-/origin,mfojtik/origin,openshift/origin,jsafrane/origin,jim-minter/origin,soltysh/origin,sjug/origin,hroyrh/origin,sallyom/origin,sferich888/origin,jim-minter/origin,ironcladlou/origin,dinhxuanvu/origin,JacobTanenbaum/origin,bparees/origin,jeremyeder/origin,mahak/origin,Miciah/origin,deads2k/origin,sjug/origin,coreydaley/origin,pecameron/origin,openshift/origin,linzhaoming/origin,xiuwang/origin,tnozicka/origin,pweil-/origin,csrwng/origin,pecameron/origin,dinhxuanvu/origin,spadgett/origin,dinhxuanvu/origin,sdminonne/origin,sdminonne/origin,sdminonne/origin,mfojtik/origin,akram/origin,deads2k/origin,bparees/origin,sferich888/origin,csrwng/origin,tnozicka/origin,ingvagabund/origin,enj/origin,mfojtik/origin,Miciah/origin,sferich888/origin,mkumatag/origin,ironcladlou/origin,anpingli/origin,spadgett/origin,coreydaley/origin,JacobTanenbaum/origin,dinhxuanvu/origin,spadgett/origin,gabemontero/origin,Miciah/origin,jeremyeder/origin,enj/origin,spadgett/origin,soltysh/origin,hroyrh/origin,nak3/origin,jsafrane/origin,deads2k/origin,mkumatag/origin,bparees/origin,JacobTanenbaum/origin,sallyom/origin,tnozicka/origin,tnozicka/origin,pweil-/origin,linzhaoming/origin,jeremyeder/origin,anpingli/origin,xiuwang/origin,anpingli/origin,spadgett/origin,sallyom/origin,akram/origin,jeremyeder/origin