documentation: check deps.deb.txt against debian/control

Add the check-deps.deb.txt makefile target to check if the content of
deps.deb.txt matches the Build-Depends field of debian/control. If it
does not, display a diff that can be used to patch it. Add the check to
the make check target.

http://tracker.ceph.com/issues/10175 Fixes: #10175

Signed-off-by: Loic Dachary <ldachary@redhat.com>
documentation: update deps.deb.txt to match debian/control

As instructed by make check-deps.deb.txt

Signed-off-by: Loic Dachary <ldachary@redhat.com>