Provided Dockerfile does not expose Grafeas server

[jonpulsifer]

I pointed someone at this repo and they said the provided Dockerfile does not work. Upon review the sample server uses localhost instead of 0.0.0.0 such that I had to provide a config file.

Thoughts on making it "work" out of the box?

~/src/github.com/jonpulsifer/grafeas (expose-me) $ docker run -d --rm -p 8080:8080 grafeas
~/src/github.com/jonpulsifer/grafeas (expose-me) $ curl localhost:8080/v1alpha1/projects
{"projects":[],"nextPageToken":"0"}

proposed changes:

index 8c0deaa..f76dd49 100644
--- a/samples/server/go-server/api/server/config/config.go
+++ b/samples/server/go-server/api/server/config/config.go
@@ -41,7 +41,7 @@ type config struct {
 func defaultConfig() *config {
        return &config{
                API: &api.Config{
-                       Address:  "localhost:8080",
+                       Address:  "0.0.0.0:8080",
                        CertFile: "",
                        KeyFile:  "",
                        CAFile:   "",

If this cromulates I'll open a PR