testRequestFailure and testPesistentServiceConnection failing

[drigz]

c746aed (#242) seems to have broken testRequestFailure and testPesistentServiceConnection. The stacktrace in both cases is similar:

java.util.ConcurrentModificationException
	at java.util.HashMap$HashIterator.nextNode(HashMap.java:1438)
	at java.util.HashMap$EntryIterator.next(HashMap.java:1472)
	at java.util.HashMap$EntryIterator.next(HashMap.java:1470)
	at com.google.common.collect.AbstractMultimap$EntryIterator.findValueIteratorAndKey(AbstractMultimap.java:1133)
	at com.google.common.collect.AbstractMultimap$EntryIterator.next(AbstractMultimap.java:1147)
	at com.google.common.collect.AbstractMultimap$EntryIterator.next(AbstractMultimap.java:1117)
	at com.google.common.collect.TransformedIterator.next(TransformedIterator.java:48)
	at org.ros.node.DefaultNodeMainExecutor.shutdown(DefaultNodeMainExecutor.java:161)
	at org.ros.RosTest.tearDown(RosTest.java:54)

[dambrosio]

@drigz I am seeing this as well!

[jubeira]

Closed via #296.