Merge changes from topics "CATEGORY_ERROR_IKE", "CATEGORY_ERROR_NETWORK", "CATEGORY_ERROR_USER_DEACTIVATED", "CATEGORY_EVENT_ALWAYS_ON_STATE_CHANGED"

* changes:
  Test VpnManager event for CATEGORY_EVENT_NETWORK_ERROR
  Test VpnManager event for CATEGORY_EVENT_IKE_ERROR
  Test VpnManager event for CATEGORY_EVENT_ALWAYS_ON_STATE_CHANGED
  Test VpnManager event for CATEGORY_EVENT_DEACTIVATED_BY_USER