Merge changes Icb59b15d,I6fc6a266,I5cc340e5,I94db52a8

* changes:
  Request Test Networks for VCNs when in Test Mode.
  Specify if a VCN is in 'test-mode' in VcnContext.
  Create test-mode for VcnConfig.
  Require MOBIKE for IkeSessionParams in VCN configs.