Merge changes from topics "CATEGORY_ERROR_IKE", "CATEGORY_ERROR_NETWORK",...

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

* changes:
  Send VPN manager event when there is a network error
  Send VPN manager event when there is an IkeProtocolException
  Send VPN manager event when VPN is deactivated
  Send VPN manager event when VPN always-on status is changed