nut-monitor failed to create required dir /var/etc/nut, as
well as failing to set appropriate user on the directory and
conf files.  Fixing this closes
https://github.com/openwrt/packages/issues/6644

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

Use /var/run/nut as statepath and set appropriate owner
and permissions on /var/run/nut in order to avoid pidfile
for nut being world-readable.

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

An older version of nut is in oldpackages. This commit is based on that
package and bumps the version to the latest release along with unifying
the server and client packages. More build options are provided for any
custom configuration but the defaults provide a working client and
server install which only needs a UPS driver. Drivers still build as
individual packages to minimise bloat. SSL support has also been added.

Signed-off-by: Martin Rowe <cyanidium@users.noreply.github.com>