Merge branch '22818-licence-gitignore-and-yml-endpoints-removal-ee' into 'master'

Backport "Remove deprecated templates endpoints in V4"

See merge request !1214

app/assets/javascripts/api.js

@@ -12,7 +12,7 @@
     gitignorePath: "/api/:version/templates/gitignores/:key",
     gitlabCiYmlPath: "/api/:version/templates/gitlab_ci_ymls/:key",
     ldapGroupsPath: "/api/:version/ldap/:provider/groups.json",
-    dockerfilePath: "/api/:version/dockerfiles/:key",
+    dockerfilePath: "/api/:version/templates/dockerfiles/:key",
     issuableTemplatePath: "/:namespace_path/:project_path/templates/:type/:key",
     group: function(group_id, callback) {
       var url = Api.buildUrl(Api.groupPath)