setup_ip: turn off sg
setup_ip: turn off sg

Apparently vif frontend has broken sg implementation; we already worked around
it in init.d script via ethtool; now do the same in setup_ip. It is relevant
when attaching firewallvm to a different netvm on the fly.

QubesOS/qubes-core-admin,woju/qubes-core-admin,marmarek/qubes-core-admin,woju/qubes-core-admin,woju/qubes-core-admin,marmarek/qubes-core-admin,QubesOS/qubes-core-admin,marmarek/qubes-core-admin,woju/qubes-core-admin,QubesOS/qubes-core-admin