[][openwrt][common][crypto][Remove ipsec service in strongswan]

[Description]
Remove ipsec service in strongswan.
strongswan-ipsec is now deprecated. swanctl is recommanded.
Additionally, ipsec service will conflict with swanctl. So,
use strongswan-ipsec only for loading ipsec.conf now.

[Release-log]
N/A


Change-Id: I1d7b9757fc48635351989848d7592d0aace21f4a
Reviewed-on: https://gerrit.mediatek.inc/c/openwrt/feeds/mtk_openwrt_feeds/+/8258765
1 file changed