Add missing oslo.service options

Closes-Bug: #1940734
Change-Id: I42d76c7a085e3ded04b45f89469b4b66d6a426ce
(cherry picked from commit c1eaf108f8)
(cherry picked from commit 92b8330f99)
(cherry picked from commit 857d01d2ec)
(cherry picked from commit 5f7198a0b4)

etc/oslo-config-generator/manila.conf

@@ -8,5 +8,8 @@ namespace = oslo.log
 namespace = oslo.messaging
 namespace = oslo.middleware
 namespace = oslo.policy
+namespace = oslo.service.periodic_task
+namespace = oslo.service.service
 namespace = oslo.service.sslutils
+namespace = oslo.service.wsgi
 namespace = keystonemiddleware.auth_token