license: relicense "libnm-core/nm-dbus-interface.h" under LGPL-2.1+

>>>

  H0=a3e75f329446a93a61ca4c458a7657bd919f4fe6
  commit_has_file() {
      git ls-tree -r "$1" | grep -q "\\s$2"\$
  }
  print_commit_authors() {
      git --no-pager log --full-history --follow --no-merges --pretty='format:<%ae>' $H0 -- "$1" | sort | uniq
  }
  print_blame_authors() {
      local LAST_H

      if commit_has_file $H0 "$1"; then
          LAST_H=$H0
      else
          LAST_H="$(git log --full-history --no-merges -n1 --pretty='format:%H' $H0 -- "$1")"^1
      fi
      git blame --no-progress -C -C -C20 -M -M10 -e "$LAST_H" -- "$1" | sed 's/.*\(<[^>]\+@[^>]\+>\).*/\1/' | sort | uniq
  }
  print_grep() {
      git --no-pager log -p --full-history --follow $H0 -- "$1" | grep -i '[a-z0-9]@\|author\|copyright' | sort | uniq
  }
  prefix() {
      sed "s/^/>>>$1 /"
  }
  collect_all() {
      for F; do
         print_commit_authors "$F" | prefix 1
         echo
         print_blame_authors "$F" | prefix 2
         echo
         print_grep "$F" | prefix 3
      done |
      sort |
      uniq |
      sed 's/@/(at)/'
  }

  collect_all \
      include/NetworkManager.h \
      libnm-core/NetworkManager.h \
      libnm-core/nm-dbus-interface.h \
      libnm-util/NetworkManager.h \
      NetworkManager.h \
      ;

<<<

>>>1 <alfonso.sanchez-beato(at)canonical.com>
>>>1 <bberg(at)redhat.com>
>>>1 <bgalvani(at)redhat.com>
>>>1 <caillon(at)redhat.com>
>>>1 <daniel(at)gnoutcheff.name>
>>>1 <danw(at)gnome.org>
>>>1 <dcbw(at)redhat.com>
>>>1 <dsd(at)laptop.org>
>>>1 <gcampagna(at)src.gnome.org>
>>>1 <jarteaga(at)jbeta.is>
>>>1 <jiri(at)resnulli.us>
>>>1 <jklimes(at)redhat.com>
>>>1 <jlu(at)pengutronix.de>
>>>1 <lkundrak(at)v3.sk>
>>>1 <luzpaz(at)users.noreply.github.com>
>>>1 <mvollmer(at)redhat.com>
>>>1 <pktoss(at)gmail.com>
>>>1 <radykal(at)radykal.com>
>>>1 <rml(at)novell.com>
>>>1 <rodrigo(at)gnome-db.org>
>>>1 <tambet(at)gmail.com>
>>>1 <tambet(at)ximian.com>
>>>1 <tgraf(at)redhat.com>
>>>1 <thaller(at)redhat.com>
>>>1 <thomasbechtold(at)jpberlin.de>
>>>1 <tredaelli(at)redhat.com>
>>>2 <bberg(at)redhat.com>
>>>2 <bgalvani(at)redhat.com>
>>>2 <blueowl(at)centrum.cz>
>>>2 <daniel(at)gnoutcheff.name>
>>>2 <danw(at)redhat.com>
>>>2 <dcbw(at)redhat.com>
>>>2 <jarteaga(at)jbeta.is>
>>>2 <jiri(at)resnulli.us>
>>>2 <jlu(at)pengutronix.de>
>>>2 <lkundrak(at)v3.sk>
>>>2 <luzpaz(at)users.noreply.github.com>
>>>2 <mvollmer(at)redhat.com>
>>>2 <pktoss(at)gmail.com>
>>>2 <radykal(at)radykal.com>
>>>2 <rml(at)novell.com>
>>>2 <tambet(at)gmail.com>
>>>2 <tgraf(at)redhat.com>
>>>2 <thaller(at)redhat.com>
>>>2 <thomasbechtold(at)jpberlin.de>
>>>2 <tredaelli(at)redhat.com>
>>>3 [...] Red Hat, Inc.
>>>3 Thiago Bauermann <thiago.bauermann(at)gmail.com>
>>>3 <j(at)bootlab.org>

Most contributors on this list agreed to relicensing according to RELICENSE.md.

The following copyright holders did not answer the request for agreeing to
relicensing:

- <caillon(at)redhat.com>: the only contributions are removing code.
  Also, Christopher was working for Red Hat at that time.

- <j(at)bootlab.org>: the patch was trivial, but the relevant code also got
  removed by commit f003ba8ef7.

- <jiri(at)resnulli.us>: a trivial contribution to the header. Also,
  Jiri was working for Red Hat at that time.

- <radykal(at)radykal.com>: fix spelling error in code comment.

- <rodrigo(at)gnome-db.org>: trivial contribution of adding a #define for
  NM_DBUS_PATH_CONNECTION_SETTINGS.

- <tgraf(at)redhat.com>: a trivial contribution to the header. Also,
  Thomas was working fro Red Hat at that time.

- <thiago.bauermann(at)gmail.com>: add a define to the header. This
  was later removed by commit 7a8f33aa3d.

While not everybody agreed to this relicensing, I think the not covered
contributions are trivial additions to our header file. Also, this file
was always part of libnm. While it had the wrong license comment, it was
never intended to be GPL licensed.

libnm-core/nm-dbus-interface.h

@@ -1,4 +1,4 @@
-/* SPDX-License-Identifier: GPL-2.0+ */
+/* SPDX-License-Identifier: LGPL-2.1+ */
 /*
  * Copyright (C) 2004 - 2018 Red Hat, Inc.
  */