Added [suite state polling] to the suite.rc reference.
Updated tests/cylc-get-config.

The previous commit changed a suite state polling config item name
from owner to user, and also affected config dict output ordering.
Merge pull request #777 from hjoliver/suite-state-polling-doc

Added [suite state polling] to the suite.rc reference.
Merge remote branch 'upstream/master' into minor-tests-refine