fix DatabaseDescriptor.hasExistingNoSystemTables to skip system table correctly
patch by Jackson Chung; reviewed by jbellis for CASSANDRA-5289
log warnings about java versions that you probably shouldn't be running
patch by Joaquin Casares; reviewed by jbellis for CASSANDRA-4570
add logging of data directories and multithreaded_compaction
patch by Joaquin Casares; reviewed by jbellis for CASSANDRA-4570
fix DatabaseDescriptor.hasExistingNoSystemTables to skip system table correctly
patch by Jackson Chung; reviewed by jbellis for CASSANDRA-5289
SYSTEM_KS -> SYSTEM_TABLE for 1.1
merge from 1.1