Migrate from /etc/default/nfs-* to /etc/nfs.conf

This was just done in Debian:
https://salsa.debian.org/kernel-team/nfs-utils/-/merge_requests/10

This bug was fixed in the package nfs-utils - 1:2.6.1-1ubuntu1

---------------
nfs-utils (1:2.6.1-1ubuntu1) jammy; urgency=medium

  * Merge with Debian unstable (LP: #1960829). Remaining changes:
    - d/control: don't provide libnfsidmap2 in libnfsidmap1. This
      package contains not only plugins, but an actual shared library,
      with a different soname.
    - d/NEWS: explain some of the major changes in 2.6.x
    - Don't install the regex module, as it's built by
      src:libnfsidmap-regex which is in Universe (MIR: #1960824)
      + d/control: don't conflict/break/etc with libnfsidmap-regex
      + d/libnfsidmap1.install: don't install regex.so
      + d/not-installed: mark files we knowingly don't include in the
        packaging
      + d/p/remove-regex-from-docs.patch: remove the regex section from
        the idmapd.conf(5) manpage, as we are not building that plugin in
        this package
    - Update README files:
      + d/README.Ubuntu: explains some of the packaging decisions
      + d/README.Debian.nfsv4: removed as the content is out of date
      + d/nfs-common.docs: install README.Ubuntu instead of
        README.Debian.nfsv4
      + d/libnfsidmap1.docs: install README.Ubuntu
  * Dropped:
    - d/nfs-common.postinst: always start nfs-utils.service, so the restart in
      the #DEBHELPER# section can do its job if needed
      [Fixed with the upstream re-arrangement of systemd units]
  * Added:
    - d/nfsconvert.py: add short "u" option for mountd's no-udp
    - d/NEWS: update
    - d/nfs-common.postrm: also purge /etc/nfs.conf.d/local.conf
    - d/nfs-common.dirs: we also own /etc/nfs.conf.d
    - d/README.Ubuntu: update
    - d/nfs-*.bug-script: update to also include /etc/nfs.conf and
      /etc/nfs.conf.d/*.conf
    - New apport hook (LP: #1961058):
      + d/source.apport: apport hook for nfs-utils
      + d/control: build-depend dh-apport
      + d/rules: build with apport, and install the hook in the
        nfs-common package which is installed on both client and servers
    - Add more DEP8 tests (LP: #1960828):
      + d/t/{control,kerberos-mount,util}: test NFSv4 krb5p mounts
      + d/t/{control, v3-moun}t: specific NFSv3 mount test

 -- Andreas Hasenack <email address hidden> Fri, 04 Mar 2022 17:44:10 -0300