Set a sane default for state_path

This change set a sane default to state_path, removed no more used cfg
options, and put the previous state_path for tests only.

DocImpact
Closes bug: #1240879

Change-Id: If56b60950d8ebf9111ef99bfbf2cb549bbb6b29b
Merge "Set a sane default for state_path"