Various issues with access rights...

The user needs access to:
- /var/run/ to create several files (gvm-create-functions, gvm-helping...).
- /var/log/gvm/ to write gvmd.log


should we create a special user _gvm?
should we run all with sudo (in this case we need a user root in the
database?)?

We need to find a global solution for gvm package.
(for the openvas-scanner user needs access to /var/lib/openvas for
greenbone-nvt-sync and the script can't be run as root)

