Add a basic assess_status helper to evaluate the current state of
the unit; this is currently just a check to ensure that the
odl-controller service is running.
Closes-Bug: 1632032
Change-Id: I008cdf0da04f2ad68291a53ae6a8cb7334979cf6
All contributions to this charm where made under Canonical
copyright; switch to Apache-2.0 license as agreed so we
can move forward with official project status.
Change-Id: Ibf6fa0c9554e852da885068c23ba06252745a14e