Milo: Add an option to hide green steps

milo/appengine/buildbot/build.go

Index: milo/appengine/buildbot/build.go
diff --git a/milo/appengine/buildbot/build.go b/milo/appengine/buildbot/build.go
index 5f0b92f19d184d867e89981ad33f97e4f5381581..07f48746057f51eeb24c87d0268bc6c6bc989a4f 100644
--- a/milo/appengine/buildbot/build.go
+++ b/milo/appengine/buildbot/build.go
@@ -226,6 +226,11 @@ func components(b *buildbotBuild) (result []*resp.BuildComponent) {
 			}
 		}
 
+		// Raise the interesting-ness if the step is not "Success".
+		if bc.Status != resp.Success {
+			bc.Verbosity = resp.Interesting
+		}
+
 		remainingAliases := stringset.New(len(step.Aliases))
 		for linkAnchor := range step.Aliases {
 			remainingAliases.Add(linkAnchor)