Cleanup API GET services endpoint

We used to return service password for admin users.
This has been removed as part of a security fix
and this commit removes some leftover of this feature

lib/api/services.rb

@@ -115,7 +115,7 @@ module API
       end
       get ":id/services/:service_slug" do
         service = user_project.find_or_initialize_service(params[:service_slug].underscore)
-        present service, with: Entities::ProjectService, include_passwords: current_user.admin?
+        present service, with: Entities::ProjectService
       end
     end
 

spec/requests/api/services_spec.rb

@@ -4,7 +4,6 @@ require "spec_helper"
 
 describe API::Services do
   set(:user) { create(:user) }
-  set(:admin) { create(:admin) }
   set(:user2) { create(:user) }
 
   set(:project) do
@@ -88,14 +87,7 @@ describe API::Services do
         expect(response).to have_gitlab_http_status(401)
       end
 
-      it "returns all properties of service #{service} when authenticated as admin" do
-        get api("/projects/#{project.id}/services/#{dashed_service}", admin)
-
-        expect(response).to have_gitlab_http_status(200)
-        expect(json_response['properties'].keys).to match_array(service_instance.api_field_names)
-      end
-
-      it "returns properties of service #{service} other than passwords when authenticated as project owner" do
+      it "returns all properties of service #{service}" do
         get api("/projects/#{project.id}/services/#{dashed_service}", user)
 
         expect(response).to have_gitlab_http_status(200)