fixes MODULES-796

Cheat by adding quotes around policy ipsec and all following options
belonging to ipsec. Otherwise the line cannot be parsed correctly.
The list of options is taken from [1] and the output ordering was
experimentally verified with iptables-v1.4.21 on Ubuntu 14.04.

[1] http://ipset.netfilter.org/iptables-extensions.man.html