updated webvirtmgr-novnc-ubuntu
Merge branch 'novnc-ubuntu'

adds support for ubuntu init script default file [/etc/default/webvirtmgr-novnc].
this allows for local customizations of things like the user/group to run as,
the location in which the software is installed, etc.
also includes some changes to better adhere to ubuntu conventions for /run, and
some misc quoting and variable reuse.