Small but important tweaks to fix the operation of the nut initscripts
and hotplug scripts.  All hail shellcheck and proofreading and
dogfooding.

Signed-off-by: Daniel F. Dickinson <cshored@thecshore.com>

Update the commented out settings in /etc/config/nut_server that
shows the available sections with their default settings.

Signed-off-by: Daniel F. Dickinson <cshored@thecshore.com>

Clarify the different between the common nut-driver portions of
nut-server and the nut-server (upsd) proper.  nut-driver can't
be used without nut-server so there is no compelling reason
to split into a separate package, but the reorganization makes
such a move easier and makes it clear what each bit is for.

While we continue to use a single initscript, it's a properly
procdified one which handles the upsd daemon as a different
instance than the driver instances.  This resolves a race
condition in which upsd and drivers fail to start do to
a degree of interdepedence.

Also properly 'procd'ifies the nut-server initscript.

Signed-off-by: Daniel F. Dickinson <cshored@thecshore.com>

With a LuCI app (of which I have one written) ucification makes
sense (and is in fact needed), so ucify the initscripts.

Also, rather than making selection of things to include an image
a matter of selecting compile-time config options, make optional
things into seperate packages that are built in default builds,
and leave selection of what to include or not up to the user
(e.g. using ImageBuilder, or adding packages via opkg).

Signed-off-by: Daniel Dickinson <lede@cshore.thecshore.com>