Add dockerfile to build an ONOS container from the local Bazel output

Change-Id: Ia4fbbe73db2f18ae225cf4dd405b60cd8edb5557
diff --git a/tools/dev/Dockerfile-bazel.dockerignore b/tools/dev/Dockerfile-bazel.dockerignore
new file mode 100644
index 0000000..47ba258
--- /dev/null
+++ b/tools/dev/Dockerfile-bazel.dockerignore
@@ -0,0 +1,3 @@
+# Ignore everything and allow only the ONOS tar
+*
+!onos.tar.gz
\ No newline at end of file