ipaclient.plugins: Use api_version from internally called commands
In client plugins make sure the api_version is 'inherited' from server command
that is internally called. Otherwise the api_version is obtained from client
API instance. When calling server command from client command 'version' is
passed in options and it overrides the right one. Server then refuses to handle
such call.
https://fedorahosted.org/freeipa/ticket/6539
Reviewed-By: Martin Basti <mbasti@redhat.com>