ixgbe: Report SR-IOV VF statusHEADmain

Expose cached VF configuration, policy, and runtime state through the
iflib VF status method.  Include access or trunk VLAN mode, transmit and
receive queue counts selected by the current virtualization mode,
negotiated mailbox API, PF traffic permission, fault containment, and
quarantine state.

Initialize every cached API version before VF enumeration so an
unconfigured slot cannot be mistaken for API 1.0.

The query does not issue mailbox requests or read hardware registers.

Sponsored by:	BBOX.io

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