s4/scripting: Remove legacy selftest-vars.sh script
This script was added in 2010 and has only been sporadically kept
up-to-date since. It doesn't appear to work (I think that selftest
and the testenvs have perhaps grown in complexity since 2010 and it's no
longer possible to try to access a testenv from a different
process-space, due to how we use the cwrap libraries).
There's now an alternative (export_envvars_to_file()) in the selftest
code to regenerate a similar file, if anyone actually needs it.
Signed-off-by: Tim Beale <timbeale@catalyst.net.nz>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>