Add a small service to the high level core set of system services to control the configuration of the native common time service. This service is responsible for controlling policy regarding when the common time service should be allowed to run, which networks it is allowed to run on, what priority it runs at in the master election algorithm, and so on. Change-Id: I37308e882a0e8c4cd3e38c4f47b7c40b9150ba31