Add local-up.sh

Developers can run `hack/local-up.sh` to setup up a local environment
including:
1. a local k8s cluster with a master node.
2. a kubeedge node.
3. our gm/lc.

Based on the kubeedge-local-up script which builds a local k8s cluster
and kubeedge, our local-up script installs our package locally for
simply developing and preparing for e3e tests.

It does:
1. build the gm/lc/worker images.
2. download kubeedge source code and run its localup script.
3. prepare our k8s env.
4. config gm config and start gm.
5. start lc.
6. add cleanup

For cleanup, it needs to do our cleanups before kubeedge cleanup
otherwise lc cleanup (via kubectl delete) is stuck and lc container is
kept running.

.dockerignore

@@ -0,0 +1,8 @@
+# temp build directories
+_output
+
+tmp
+*-tmp
+
+# dot files
+.*