more stability fixes

more stability fixes

Remove conditional to not check VNF topology
add empty string verification for serviceName field
Add junits for CNRCR and NtwkAdptr changes.
Add search in new CollNtwkResCust tbl to get NtwkResource.
-  Updated test data files to include 'pre-load' flag in both
VfModuleOperation and NetworkOperation json test data files.
-  MSO to not to send <preload>boolean</from-preload> to SDNC in
network-topology-opertion and vf-module-topology-operation. Updated
GeneralTopologyObjectMapper to set 'from-preload' to null so that
elements with Nulls are not sent to SDNC. Updated
buildNetworkInformation() and buildVfModuleInformation() methods.
update flow stats to not cause bpmn flow to crash
Fix headers so SDNC does not return XML
Add implementation of deleteVolumeGroupResponse parsing; fix JUnits
that worked by accident.

Change-Id: Ia96d552d731e112505fcf739029a6fd4d0134546
Issue-ID: SO-1061
Signed-off-by: Benjamin, Max (mb388a) <mb388a@us.att.com>