Simplify Dockerfile

Change-Id: I302dc1bf83115007919c9745912812fac8ac6648
diff --git a/docker/entrypoint.sh b/docker/entrypoint.sh
new file mode 100755
index 0000000..45b7108
--- /dev/null
+++ b/docker/entrypoint.sh
@@ -0,0 +1,8 @@
+#!/usr/bin/env bash
+
+service openvswitch-switch start
+ovs-vsctl set-manager ptcp:6640
+
+bash
+
+service openvswitch-switch stop