add podman remote client

podman client that is capable of:
 * images
 * ps
 * rm
 * rmi

this is only a mockup to frame out and prove python library and ssh
tunnelling usage.

Signed-off-by: baude <bbaude@redhat.com>

Closes: #986
Approved by: rhatdan

contrib/python/cmd/rmi.py

@@ -0,0 +1,25 @@
+from pman import PodmanRemote
+from utils import write_out, write_err
+
+def cli(subparser):
+    imagesp = subparser.add_parser("rmi",
+                                   help=("delete one or more images"))
+    imagesp.add_argument("--force", "-f", action="store_true", help="force delete", dest="force")
+    imagesp.add_argument("delete_targets", nargs='*', help="images to delete")
+    imagesp.set_defaults(_class=Rmi, func='remove_images')
+
+
+class Rmi(PodmanRemote):
+
+    def remove_images(self):
+        delete_targets = getattr(self.args, "delete_targets")
+        if len(delete_targets) < 1:
+            raise ValueError("you must supply at least one image id or name to delete")
+        force = getattr(self.args, "force")
+        for d in delete_targets:
+           image = self.client.images.get(d)
+           if image["containers"] > 0 and not force:
+               write_err("unable to delete {} because it has associated errors. retry with --force".format(d))
+               continue
+           image.remove(force)
+           write_out(image["id"])