VPP-958: RPM Update wipes out local changes to 80-vpp.conf

VPP-958: RPM Update wipes out local changes to 80-vpp.conf

Changed the %config to %config(noreplace) for the two files in the
vpp.spec file that use it, 80-vpp.conf and startup.conf. Any local
changes to these files will now remain. If a newer version of the file
is published, the new version will be copied over as {filename}.rpmnew,
and the changes will not be applied without manual intervention.

Change-Id: I00b2c7abca20bc33f82479374dd184fc57a9abc5
Signed-off-by: Billy McFall <[email protected]>