Shouldn't add insecure registries to list of search registries
Shouldn't add insecure registries to list of search registries

The search registries and insecure registries are separate lists,
and should not be merged just because the InsecureSkipTLSVerify is
set

Signed-off-by: Daniel J Walsh <dwalsh@redhat.com>

Closes: #759
Approved by: mtrmac

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