Replace unused oslo.service options

In threading mode the options implemented in oslo.service are not used,
in favor of the options imported from cotyledon.

Change-Id: I8a94bfea5fe9f9f54077e5d958198ede09f78903
Signed-off-by: Takashi Kajinami <kajinamit@oss.nttdata.com>

tools/config/ironic-config-generator.conf

@@ -11,7 +11,7 @@ namespace = oslo.concurrency
 namespace = oslo.policy
 namespace = oslo.log
 namespace = oslo.reports
-namespace = oslo.service.service
+namespace = cotyledon
 namespace = oslo.service.periodic_task
 namespace = oslo.service.sslutils
 namespace = oslo.versionedobjects