Add loadbalancing tests
Multiple cluster support

Conflicts:
	tests/integration/__init__.py
decommission and bootstrap ccm commands
Spotted small bug in random test
Remove try/except blocks and use use_*dc() instead
Increase wait_for_down. Replace log messages.
Grab futures before counting coordinators
Remove double future.result()
Confirm stacktrace
Fix DCAware load imbalance due to set orderings
Add *.egg to .gitignore
Use execute_concurrent
Merge branch 'master' into load_balancing_tests_master
Don't log stacktrace for NoConnectionsAvailable
Cleaned up and re-tested test cases
Add note about raising trace timeout to error message
Preserve all exc info when raising in execute_concurrent()
Merge pull request #105 from joaquincasares/load_balancing_tests_master

Load balancing tests (against master)
Prettier log message for scheduled retries
Use execute_concurrent_with_args for loadbalancing tests