CLOUDSTACK-7168: Revert "Fixed Coverity Issues reported" that broke CI

This reverts commit 4523490d44160b054de9e943f72db1d0ce06054a.
rename networkMgr to networkMdl to prevent name clashes in mocks of
VirtualRouterElement and VirtualNetworkApplianceManagerImpl
highlevel 'unit'-test for refactoring of (Vpc)VirtualNetworkApplianceManagerImpl
rats