Allow --cmd parameter to have commands as values
Allow --cmd parameter to have commands as values

Signed-off-by: TomSweeneyRedHat <tsweeney@redhat.com>

Closes: #520
Approved by: rhatdan

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