rootless, create: support --pod

Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>

Closes: #1372
Approved by: mheon

cmd/podman/main.go

@@ -28,6 +28,7 @@ var (
 var cmdsNotRequiringRootless = map[string]bool{
 	"help":    true,
 	"version": true,
+	"create":  true,
 	"exec":    true,
 	// `info` must be executed in an user namespace.
 	// If this change, please also update libpod.refreshRootless()