Search Solaris-alternate path for Java binary

Patch by eevans for CASSANDRA-4638
actually create PID directory

Patch by Anton Winter; reviewed by eevans for CASSANDRA-6101
fix broken process search pattern

Patch by Laurent Raufaste; reviewed by eevans for CASSANDRA-6090
switch retryPolicy logging to debug
Merge branch 'cassandra-2.0' into trunk
add CF name to log message
Merge branch 'cassandra-2.0' into trunk