Add --ip flag and plumbing into libpod

Add the --ip flag back with bash completions. Manpages still
missing.

Add plumbing to pass appropriate the appropriate option down to
libpod to connect the flag to backend logic added in the previous
commits.

Signed-off-by: Matthew Heon <matthew.heon@gmail.com>

completions/bash/podman

@@ -1512,6 +1512,7 @@ _podman_container_run() {
 		--hostname -h
 		--image-volume
 		--init-path
+		--ip
 		--ipc
 		--kernel-memory
 		--label-file