1. Make source and conditions configurable.

2. Add multiple events and conditions support in problem interface.

pkg/problemclient/problem_client.go

@@ -123,6 +123,7 @@ func getEventRecorder(c *client.Client, nodeName, source string) record.EventRec
 }
 
 func getNodeRef(nodeName string) *api.ObjectReference {
+	// TODO(random-liu): Get node to initalize the node reference
 	return &api.ObjectReference{
 		Kind:      "Node",
 		Name:      nodeName,