conformance testing: ignore buildah.BuilderIdentityAnnotation labels
conformance testing: ignore buildah.BuilderIdentityAnnotation labels

Ignore the buildah.BuilderIdentityAnnotation label when comparing images
that we build with images built using other tools, which of course don't
automatically set that label.

Signed-off-by: Nalin Dahyabhai <f562fcb2a0b898bf0be1afc867ea92325d8f825f@redhat.com>

projectatomic/buildah,projectatomic/buildah,nalind/buildah-1,rhatdan/buildah,nalind/buildah-1,rhatdan/buildah,rhatdan/buildah,nalind/buildah,TomSweeneyRedHat/buildah,TomSweeneyRedHat/buildah,TomSweeneyRedHat/buildah,projectatomic/buildah,nalind/buildah,nalind/buildah-1