scalability_test: fix pylint warning and enable coding style test

6 jobs for for_testrunner_2 in 0 seconds (queued for 1 second)
Status Job ID Name Coverage
  External
passed ERP5.CodingStyleTest-TestRunner2

03:06:16

failed ERP5.UnitTest-TestRunner2

08:43:49

passed ERP5.CodingStyleTest-TestRunner2

02:59:04

failed ERP5.UnitTest-TestRunner2

07:36:53

canceled ERP5.UnitTest-TestRunner2

failed ERP5.UnitTest-TestRunner2

01:27:40