igbv: Recover when the PF mailbox is unavailableHEADmain

A VF reset can sanitize its retained queue registers even when the PF
does not complete the cooperative mailbox handshake.  Keep those two
states separate.  Do not program or enable the rings until both queue
sanitation and mailbox initialization have succeeded.

Report either initialization failure to iflib so the interface remains
stopped.  Stopped admin and media-status passes now publish cached
link-down state without polling the mailbox.  While the VF remains
administratively up, retry complete initialization after 250 ms, one
second, four seconds, and then at a capped eight-second interval.
Conditional iflib reset requests ensure an intervening administrative
down cancels a queued retry.

Avoid a redundant mailbox reset in the stop half of an immediate iflib
reinitialization; the following init performs the required reset.
Preserve the reset on an ordinary administrative stop and keep the
existing bounded queue-sanitation retry policy independent from
mailbox liveness recovery.

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