Merge branch 'fix-ruby2.5-spec-failure' into 'master'

Fix spec failure with Ruby 2.5

See merge request gitlab-org/gitlab-shell!266

spec/gitlab_net_spec.rb

@@ -67,7 +67,7 @@ describe GitlabNet, vcr: true do
 
   describe '#lfs_authenticate' do
     context 'lfs authentication succeeded' do
-      let(:repository_http_path) { URI.join(internal_api_endpoint.sub('api/v4', ''), project).to_s }
+      let(:repository_http_path) { URI.join(internal_api_endpoint.sub('/api/v4', ''), project).to_s }
 
       context 'for download operation' do
         it 'should return the correct data' do