MENSHEN_API now needs explicit https:// prefix
this is required as of leap/menshen@fa1e4442
else, menshen fails with
2022/02/15 09:17:58 MENSHEN_API = api.vpn.codigosur.org
2022/02/15 09:17:58 Invalid API: api.vpn.codigosur.org
Request made to kill system.
system startup cancelled due to error: menshen.service failed on start-up with result '<ProcStatus exit_status=1>'