MFC r362078:

Decode the "LACP Fast Timeout" LAGG option flag

r286700 added the "lacp_fast_timeout" option to `ifconfig', but we forgot to
include the new option in the string used to decode the option bits. Add
"LACP_FAST_TIMO" to LAGG_OPT_BITS.

Also, s/LAGG_OPT_LACP_TIMEOUT/LAGG_OPT_LACP_FAST_TIMO/g , to be clearer that
the flag indicates "Fast Timeout" mode.

MFC r317755, r317758

r317755:
Various Coverity fixes in ifconfig(8)

* Exit early if kldload(2) fails (1011259). This is the only change that
affects ifconfig's behavior.
* Close memory and resource leaks (1305624, 1305205, 1007100)
* Mark usage() as _Noreturn (1305806, 1305750)
* Fix some dereference after null checks (1011474, 270774)

Reported by: Coverity
CID: 1305624, 1305205, 1007100, 1305806, 1305750, 1011474,
CID: 270774, 1011259
Reviewed by: cem
Sponsored by: Spectra Logic Corp
Differential Revision: https://reviews.freebsd.org/D10587

r317758:
Unbreak ifconfig for mlx4en(4) after r317755

ifconfig doesn't correctly infer mlx interfaces' module names, so it will
attempt to load the mlx(4) module even when not necessary.

Reported by: rstone
X-MFC-With: 317755
Sponsored by: Spectra Logic Corp

MFC r288305:

Replace N #defines with nitems to simplify ifconfig code slightly

MFC r286700

Make LAG LACP fast timeout tunable through IOCTL.

MFC 272159,272161,272386,272446,272547,272548,273210:

- Make lagg protos a enum.

- When reconfiguring protocol on a lagg, first set it to LAGG_PROTO_NONE,
then drop lock, run the attach routines, and then set it to specific
proto. This removes tons of WITNESS warnings.

- Make lagg protocol attach handlers not failing and allocate memory
with M_WAITOK.

- Virtualize lagg(4) cloner. This change fixes a panic when tearing down
if_lagg(4) interfaces which were cloned in a vnet jail.

Sysctl nodes which are dynamically generated for each cloned interface
(net.link.lagg.N.*) have been removed, and use_flowid and flowid_shift
ifconfig(8) parameters have been added instead. Flags and per-interface
statistics counters are displayed in "ifconfig -v".

- Separate option handling from SIOC[SG]LAGG to SIOC[SG]LAGGOPTS for
backward compatibility with old ifconfig(8).

- Move L2 addr configuration for the primary port to a taskqueue. This fixes
LOR of softc rmlock in iflladdr_event handlers.

- Call if_delmulti_ifma() after LACP_UNLOCK(). This fixes another LOR.

- Fix a panic in lacp_transit_expire().

- Fix a panic in lagg_input() upon shutting down a port.

- Use printb() for boolean flags in ro_opts and actor_state for LACP.

- Fix lladdr configuration which could prevent LACP mode from working.

- Fix LORs when a laggport interface has an IPv6 LLA.

MFC r286700

Make LAG LACP fast timeout tunable through IOCTL.

MFC 272159,272161,272386,272446,272547,272548,273210:

- Make lagg protos a enum.

- When reconfiguring protocol on a lagg, first set it to LAGG_PROTO_NONE,
then drop lock, run the attach routines, and then set it to specific
proto. This removes tons of WITNESS warnings.

- Make lagg protocol attach handlers not failing and allocate memory
with M_WAITOK.

- Virtualize lagg(4) cloner. This change fixes a panic when tearing down
if_lagg(4) interfaces which were cloned in a vnet jail.

Sysctl nodes which are dynamically generated for each cloned interface
(net.link.lagg.N.*) have been removed, and use_flowid and flowid_shift
ifconfig(8) parameters have been added instead. Flags and per-interface
statistics counters are displayed in "ifconfig -v".

- Separate option handling from SIOC[SG]LAGG to SIOC[SG]LAGGOPTS for
backward compatibility with old ifconfig(8).

- Move L2 addr configuration for the primary port to a taskqueue. This fixes
LOR of softc rmlock in iflladdr_event handlers.

- Call if_delmulti_ifma() after LACP_UNLOCK(). This fixes another LOR.

- Fix a panic in lacp_transit_expire().

- Fix a panic in lagg_input() upon shutting down a port.

- Use printb() for boolean flags in ro_opts and actor_state for LACP.

- Fix lladdr configuration which could prevent LACP mode from working.

- Fix LORs when a laggport interface has an IPv6 LLA.