Update doc/ref/states/highstate.rst

Avoid any ambiguity about dots in IDs.
Merge pull request #3252 from gotcha/patch-2

Documentation : Avoid any ambiguity about dots in IDs.
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`.