nut: Reorganize nut-server to clarify nut-driver

nut: Reorganize nut-server to clarify nut-driver

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>