fix nfs related service names

fix nfs related service names

Upstream defines nfs related service names based on the Linux
distribution. This patch fixes the names for Debian and derivatives.

Update by Andreas Hasenack <andreas@canonical.com> (LP: #1961840):
Use nfsconf(8) if it's available, instead of parsing the old config
files in /etc/default/nfs-*

Bug-Debian: https://bugs.debian.org/929931
Bug-Ubuntu: https://bugs.launchpad.net/bugs/722201
Last-Update: 2022-09-09

Gbp-Pq: Name fix-nfs-service-name-to-nfs-kernel-server.patch