Remove extra query for scaling groups
Fix connection parameters, and exception handling

Not having cql_version follow semantic versioning throws an error
that is not displayed, because the error message is set to the 'why'
field of the thrown Exception instead of 'message'.
Handle error messages better.

Since this is catching all exceptions, just make sure 'why' is
converted to 'message'.
Do not worry about exceptions from cql connection.

If any exceptions are raised, the script will fail and a proper error
message will be output.
Merge pull request #248 from rackerlabs/fixup_stats_script

Fixup stats script

Dear Exceptions, please die gracefully. Sincerely, Trevor