Bug#1013868: nfs-common: Split between Python scripts to separate package

[Gioele Barabucci <gioele@svario.it>]

Package: nfs-common
Version: 1:2.6.1-2

Dear maintainers of nfs-common,

could you please move the three Python scripts included in nfs-common to 
a separate -extras package?

Currently nfs-common Depends on `python3` and, on lean/containerized 
client systems, it is the only package that requires it. For this 
reason, in 2019 Fedora moved the scripts `mountstats`, `nfsiostat` and 
`nfsconvert` to a separate package [1,2], required on servers (for 
`nfsconver`) but not on clients.

[1] https://bugzilla.redhat.com/show_bug.cgi?id=1667889
[2] https://github.com/coreos/fedora-coreos-tracker/issues/121

Kind regards,

--
Gioele Barabucci