nut: Default to run as root but fix alt runas

Since the new hotplug script in master was not backport (new feature),
for 18.06 branch revert the old behavior of running NUT daemons and
drivers as root by default to avoid permisions problems, but backport
fix the support for running as another user for those who can set the
appropriate permissions on the USB (or other) device.

Closes: #7742

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

net/nut/Makefile

@@ -9,7 +9,7 @@ include $(TOPDIR)/rules.mk
 
 PKG_NAME:=nut
 PKG_VERSION:=2.7.4
-PKG_RELEASE:=8
+PKG_RELEASE:=9
 
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.gz
 PKG_SOURCE_URL:=http://www.networkupstools.org/source/2.7/