fix saved key cache not loading at startup; patch by yukim reviewed by jbellis for CASSANDRA-5166
Merge branch 'cassandra-1.1' into cassandra-1.2
Merge branch 'cassandra-1.2' into trunk
Preload essential gossip states before startup.
Patch by brandonwilliams, reviewed by slebresne for CASSANDRA-5107
Merge branch 'cassandra-1.2' into trunk