Update for proplib(3) API changes.

- add or adjust /* FALLTHROUGH */ where appropriate
- add __unreachable() after functions that can return but won't in
this case, and thus can't be marked __dead easily

branches: 1.4.72;
Attempt at fixing build failures after proplib was converted to bool:
FALSE -> false, TRUE -> true, boolean_t -> bool, int -> bool when
appropriate, include stdbool.h . proplib.h no longer provides boolean_t,
so it is necessary to change to bool.

From Tom Spindler (dogcow@).

Add 'service level' security for L2CAP and RFCOMM connections, following
the Linux (BlueZ) API.

- L2CAP or RFCOMM connections can require the baseband radio link
mode be any of:
authenticated (devices are paired)
encrypted (implies authentication)
secured (encryption, plus generate new link key)

- for sockets, the mode is set using setsockopt(2) and the socket
connection will be aborted if the mode change fails.

- mode settings will be applied during connection establishment, and
for safety, we enter a wait state and will only proceed when the mode
settings are successfuly set.

- It is possible to change the mode on already open connections, but
not possible to guarantee that data already queued (from either end)
will not be delivered. (this is a feature, not a bug)

- bthidev(4) and rfcomm_sppd(1) support "auth", "encrypt" and
"secure" options

- btdevctl(8) by default enables "auth" for HIDs, and "encrypt" for
keyboards (which are required to support it)

constify char *service

branches: 1.1.2; 1.1.4; 1.1.6;
update to bluetooth device attachment:

remove pseudo-device btdev(4) and inherent limitations

add bthub(4) which autoconfigures at bluetooth controllers as they
are enabled. bluetooth devices now attach here.

btdevctl(8) and its cache is updated to handle new semantics

etc/rc.d/btdevctl is updated to configure devices from a list
in /etc/bluetooth/btdevctl.conf

- add or adjust /* FALLTHROUGH */ where appropriate
- add __unreachable() after functions that can return but won't in
this case, and thus can't be marked __dead easily

Attempt at fixing build failures after proplib was converted to bool:
FALSE -> false, TRUE -> true, boolean_t -> bool, int -> bool when
appropriate, include stdbool.h . proplib.h no longer provides boolean_t,
so it is necessary to change to bool.

From Tom Spindler (dogcow@).

Add 'service level' security for L2CAP and RFCOMM connections, following
the Linux (BlueZ) API.

- L2CAP or RFCOMM connections can require the baseband radio link
mode be any of:
authenticated (devices are paired)
encrypted (implies authentication)
secured (encryption, plus generate new link key)

- for sockets, the mode is set using setsockopt(2) and the socket
connection will be aborted if the mode change fails.

- mode settings will be applied during connection establishment, and
for safety, we enter a wait state and will only proceed when the mode
settings are successfuly set.

- It is possible to change the mode on already open connections, but
not possible to guarantee that data already queued (from either end)
will not be delivered. (this is a feature, not a bug)

- bthidev(4) and rfcomm_sppd(1) support "auth", "encrypt" and
"secure" options

- btdevctl(8) by default enables "auth" for HIDs, and "encrypt" for
keyboards (which are required to support it)

constify char *service

branches: 1.1.2; 1.1.4; 1.1.6;
update to bluetooth device attachment:

remove pseudo-device btdev(4) and inherent limitations

add bthub(4) which autoconfigures at bluetooth controllers as they
are enabled. bluetooth devices now attach here.

btdevctl(8) and its cache is updated to handle new semantics

etc/rc.d/btdevctl is updated to configure devices from a list
in /etc/bluetooth/btdevctl.conf