Allow for the power state interval to be configured.

The power state interval right now is hard coded to 600 seconds.
In order to allow deployers to change this timing (and determine)
the side-effects of that change it is useful to allow this value
to be configured instead of static.

DocImpact

Change-Id: I9baf34f9b132dc20fcc096f86fa0e5794fc06312
Merge "Allow for the power state interval to be configured."