Define Wiki service
At first, only needed for gitaly#639, but later more endpoints will be added.
/cc @ahmadsherif
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
At first, only needed for gitaly#639, but later more endpoints will be added.
/cc @ahmadsherif
mentioned in issue gitaly#639
zj-gitaly-wiki-service restored source branch zj-gitaly-wiki-service