samba-tool: all subcommands know --version

samba-tool: all subcommands know --version

Before `samba-tool -V` would give you the version,
but `samba-tool spn -V` would complain.

An ad-hoc selection of sub-commands already supported --version,
depending on whether VersionOptions was manually added to the
takes_options dict. The .run() methods of these subcommands all take a
'versionopts' keyword argument, but never use it. If it was set (i.e.,
argv contained "--version"), the process never gets to .run(), so the
value of versionopts.version is always None in run(). After this
commit we can remove VersionOptions/versionopts from sub-commands.

BUG: https://bugzilla.samba.org/show_bug.cgi?id=15770

Signed-off-by: Douglas Bagnall <douglas.bagnall@catalyst.net.nz>
Reviewed-by: Jennifer Sutton <jennifersutton@catalyst.net.nz>