FElIX-4189 use atomic reference in RefPair for service object

git-svn-id: https://svn.apache.org/repos/asf/felix/trunk@1515659 13f79535-47bb-0310-9956-ffa450edef68
FELIX-3651 Location tests for LOCATION_CHANGED event and region locations

git-svn-id: https://svn.apache.org/repos/asf/felix/trunk@1515660 13f79535-47bb-0310-9956-ffa450edef68
FELIX-3651 TargetedPID tests

git-svn-id: https://svn.apache.org/repos/asf/felix/trunk@1515661 13f79535-47bb-0310-9956-ffa450edef68