Fix bug in ipsec key rotation
Fix bug in ipsec key rotation

- which would leave a stale state behind
  at each key rotation.

Signed-off-by: Alessandro Boch <5bd2eb5b6f60921d9a2b9cb6a0a86bb947f3d361@docker.com>

sainath14/libnetwork,cpuguy83/libnetwork,fcrisciani/libnetwork,WeiZhang555/libnetwork,vdemeester/libnetwork,allencloud/libnetwork,coolljt0725/libnetwork,docker/libnetwork,abhi/libnetwork,vdemeester/libnetwork,medallia/libnetwork,kolyshkin/libnetwork,mYmNeo/libnetwork,YujiOshima/libnetwork,ityangchen/libnetwork,msabansal/libnetwork,mahak/libnetwork,kolyshkin/libnetwork,abhi/libnetwork,msabansal/libnetwork,mYmNeo/libnetwork,tmakita/libnetwork,coolljt0725/libnetwork,YujiOshima/libnetwork,docker/libnetwork,fcrisciani/libnetwork,medallia/libnetwork,vdemeester/libnetwork,kolyshkin/libnetwork,allencloud/libnetwork,mahak/libnetwork,curtiszimmerman/libnetwork,ityangchen/libnetwork,mbanikazemi/libnetwork,sainath14/libnetwork,mahak/libnetwork,medallia/libnetwork,tmakita/libnetwork,abhi/libnetwork,docker/libnetwork,cpuguy83/libnetwork,mbanikazemi/libnetwork,WeiZhang555/libnetwork,curtiszimmerman/libnetwork