list_local_sessions.js cannot run concurrently with refreshLogicalSessionCacheNow

The parallel suite very occasionally fails in list_local_sessions.js when it is run concurrently with list_sessions.js. Since list_sessions.js runs the refreshLogicalSessionCacheNow command, which temporarily clears the logical session cache while it's being refreshed, this can interfere with list_local_sessions.js which is trying to enumerate the cache and verify its session still exists.