When creating ipsec_policy with transform_protocol AH-ESP,
ipsec_site_connection will always PENDING_CREATE, in vpn-agent log
it raise an ERROR: 034 Must do at AH or ESP, not neither.
Currently Openswan, Strongswan and Libreswan do not support AH-ESP.
In this patch, add a validator in service driver for Openswan,
Strongswan and Libreswan, that will raise an exception when
creating or updating the IPSec Policy transform protocol
with "ah-esp".
Other vendors can bypass validate ipsec_policy when creating and
updating transform protocol, or implement specific logic for
themselves.
DocImpact
Change-Id: I0fde0c815adb61e6eb2bf868cf57e1286e0231fc
Closes-Bug: #1488764
20a614fd64