.papr.sh: Also test with BUILDAH_ISOLATION=rootless
.papr.sh: Also test with BUILDAH_ISOLATION=rootless

After the previously-defined tests are run, run the integration tests
again with rootless isolation.

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

Closes: #873
Approved by: rhatdan

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