Add Dockerfile and make-based tooling

Change-Id: I6471c3bc2040a0a9c9c49b45beee6fcd11c77a3c
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..d37010e
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,3 @@
+bbsim
+openolt/openolt.pb.go
+coverage.txt