core: enable print_function in checkPythonSourceCodeAsJSON

This flags python2 style usage of print as a statement
6 jobs for feat/print_function in 0 seconds
Status Job ID Name Coverage
  External
passed ERP5.CodingStyleTest-TestRunner2

01:12:15

failed ERP5.UnitTest-TestRunner2

01:52:03

passed ERP5.CodingStyleTest-TestRunner2

01:19:04

passed ERP5.CodingStyleTest-TestRunner2

00:41:01

failed ERP5.UnitTest-TestRunner2

01:57:46

passed ERP5.UnitTest-TestRunner2

01:29:30