varlink images

implement varlink image functions for working with libpod with the exception of a
couple due to incompletions on the libpod side of things (build).

also, created a first pass at a libpodpy package which will stand as a client to
working with libpod's varlink methods using python.

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

Closes: #669
Approved by: baude

contrib/libpodpy/containers.py

@@ -0,0 +1,8 @@
+
+class Containers(object):
+
+    def __init__(self, client):
+        self.client = client
+
+    def List(self):
+        pass