Fixes #3272  Ensure nodetool and cassandra

Verify that nodetool and cassandra are actually installed in
addition to pycassa
Merge pull request #3274 from UtahDave/develop

Fixes #3272  Ensure nodetool and cassandra
grain fix for SUSE Enterprise Server
Merge pull request #3276 from archtaku/issue3275

grain fix for SUSE Enterprise Server
Simplify sub-classing `Master`, `Minion` and `Syndic` + PEP-8.

* Since we no longer suffer from too early logger initiation, replace any `logging.getLogger(__name__)` calls with an initial defined `logger`(not `log` so it does not clash with `salt.log`.
Comply with the convention and still provide the ability to subclass masters and minions.
The syndic also `start()`'s it does not `run()`.