ASACORE-1186 Add support for detecting idle RNs.

Add ability to detect if all LN streams have been stopped a given
period of time ago.

Change-Id: Id69792f62a20955532ee057e4e2be1e480f4a1e6
Signed-off-by: Dan Mihai <DMihai@microsoft.com>
Merge "ASACORE-1186 Add support for detecting idle RNs."