Rename
SetupIPMasqForNetwork -> SetupIPMasqForNetworks
TeardownIPMasqForNetwork -> TeardownIPMasqForNetworks
and have them take []*net.IPNet instead of *net.IPNet.
This allow the nftables backend to cleanup stale rules and recreate all
needed rules in a single transaction, where previously the stale rules
cleanup was breaking all but the last IPNet.
Fixes 61d078645a6d2a2391a1555ecda3d0a080a45831
Signed-off-by: Etienne Champetier <e.champetier@ateme.com>
