Implement git refs API for listing references (branches, tags and other) (#5354)

* Inital routes to git refs api

* Git refs API implementation

* Update swagger

* Fix copyright

* Make swagger happy add basic test

* Fix test

* Fix test again :)

routers/api/v1/swagger/repo.go

@@ -36,6 +36,20 @@ type swaggerResponseBranchList struct {
 	Body []api.Branch `json:"body"`
 }
 
+// Reference
+// swagger:response Reference
+type swaggerResponseReference struct {
+	// in:body
+	Body api.Reference `json:"body"`
+}
+
+// ReferenceList
+// swagger:response ReferenceList
+type swaggerResponseReferenceList struct {
+	// in:body
+	Body []api.Reference `json:"body"`
+}
+
 // Hook
 // swagger:response Hook
 type swaggerResponseHook struct {