Throw an error when listen_address is 0.0.0.0
Patch by brandonwilliams, reviewed by dbrosius for CASSANDRA-5865
Merge branch 'cassandra-1.2' into cassandra-2.0

Conflicts:
	src/java/org/apache/cassandra/config/DatabaseDescriptor.java
Merge branch 'cassandra-2.0' into trunk