NodePredicates gained static predicate SUSPENDED

Issue can be found in JIRA here: https://issues.apache.org/jira/browse/JCLOUDS-596

Creating a tester for SUSPENDED was recommended by Everett Toews. I basically copied the method definition for 'testNodeRunningReturnsTrueWhenRunning' and massaged it for SUSPENDED. The above minor changes you noted I can make.