DATACASS-70 - Optimizing Unit Tests for Mac thread limit

Make use of static session and template for the entire test suite.
Use same keyspace to prevent too many file writer threads.
Clean keyspace after each test.
DATACASS-70 - Fixed Table Lifecycle test with new Unit test strategy.
DATACASS-1 - WIP before merging from master
Merge branch 'master' into DATACASS-1
DATACASS-1 - wip: now working again after refactoring spring-cassandra xml namespace
DATACASS-1 - added collection safety to setters & collection-safe getters for scripts