ix0 (iflib) vlans @ head & 12-stable

[Oleg Bulyzhin]

While testing 12-stable i've found following:

current ixgbe driver is using iflib and has IFCAP_VLAN_HWFILTER
enabled by default.

/sys/net/iflib.c iflib_vlan_[un]register() functions have this code:

        /* Re-init to load the changes */
        if (if_getcapenable(ifp) & IFCAP_VLAN_HWFILTER)
                iflib_if_init_locked(ctx);

Thus any vlan reconfiguration leads to link flap. This is not
how it was before iflib conversion.

I'm not sure about other vlanhwfilter aware hardware but 
intel x520-da2 cards (82599 chip) does not require re-init
after hwfilter reconfig.

Should we extend iflib framework a bit?

-- 
Oleg.

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