server: change default sampling interval to a large value

Change default sampling interval to max integer to fix a
power consumption issue. Original implementation will keep
UE wake up every 12 minutes, which will cause issue when
doing power standby test.

Change-Id: I43782d5b8b8ae19e71d30b5230133d7780aba504
Connectivity: change method signatures

Change signatures of methods to be compliant with the parent class.
Emulate the new functionality added in ConnectivityService.

Change-Id: I4b4c828198bf7967f5d40e58ec9915d63f36949f
Merge "server: change default sampling interval to a large value"
Merge "Connectivity: change method signatures"
services-ext: change default sampling interval to -1

Change default sampling interval to -1 to avoid
sampling to resolve power consumption issue, as the
sampling statistics is not currently used by any users.

Change-Id: I2dc33d38bcea7913706b18631b782619bc4f64ca
Merge "services-ext: change default sampling interval to -1"
Server: Synchronize mNetRequestersPids

synchronize the mNetRequestersPids to avoid
concurrent modification exception.

Change-Id: If89371184885ff48f99d0859675219aad2bd56f1
CRs-fixed: 649897
Merge "Server: Synchronize mNetRequestersPids"