Pursuant to rS360398, implement driver-specific versions of the ifdi_needs_restart
iflib device method.
Some (if not most?) Intel network cards don't need reinitializing when a VLAN
is added or removed from the device hardware, so these implement ifdi_needs_restart
in a way that tell iflib not to bring the interface up or down when a VLAN is
added or removed, regardless of whether the VLAN_HWFILTER interface capability
flag is set or not.
This could potentially solve several PRs relating to link flaps that occur when
VLANs are added/removed to devices.
Signed-off-by: Eric Joyner <firstname.lastname@example.org>