Remove test_activity_stream test
Remove test_activity_stream test

mozmar/snippets-service,glogiotatidis/snippets-service,glogiotatidis/snippets-service,mozilla/snippets-service,mozmar/snippets-service,mozmar/snippets-service,mozilla/snippets-service,glogiotatidis/snippets-service,glogiotatidis/snippets-service,mozilla/snippets-service,mozilla/snippets-service,mozmar/snippets-service