Remove the stopping and starting of various network scripts on
sleep / resume.
This should no longer be needed now the various applications
(dhcpcd, ntpd, wpa_supplicant et all) are more aware to the network state
as all interface carriers should be brought down and up again.

Fixes PR misc/52397.

branches: 1.10.22;
restart dhcpcd if we get a "released" event from the vmt0 driver

- use -q to test for presence of a sysctl(7) variable silently
- modify powerd(8) sleep_button script so it can handle the soon-to-be
Xen suspend command.

provide a new 'bluetooth' rc.d script, to handle Bluetooth configuration
in a simpler manner. This replaces btattach, btconfig, bthcid, btdevctl
and sdpd scripts, and also should not require any configuration settings
other than "bluetooth=YES", though the full range of configurations is
still possible.

Use hw.acpi.sleep.state instead of machdep.sleep_state.

use '/etc/rc.d/apmd onestatus' rather than '/etc/rc.d/apmd status',
so we DTRT if apmd is set to NO in rc.conf

Stop and start bluetooth services across suspend.

If machdep.sleep_state is present, use it in favour of apm. Also stop and
start wpa_supplicant across suspend/resume just to be safe.

branches: 1.3.18; 1.3.20; 1.3.22;
Add useful example scripts for powerd acadapter, lid_switch, and
sleep_button events. These use the /dev/apm interface, so should be useful
on more than just i386.

Oops, fix comments.

Add dummy scripts for these events.