Tweak volume handling in Run()
Tweak volume handling in Run()

Make sure that we don't mount a tmpfs in volume locations where Run()
has been told to mount something else.

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

Closes: #121
Approved by: rhatdan

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