config_factory : remove C# style

Too many languages for me today: HTML, TSQL, C# and now Python 3 :D
3 jobs for acme-draft-12 in 10 minutes and 25 seconds (queued for 15 seconds)
Status Job ID Name Coverage
  Test
failed #436
jessie

00:02:25

failed #437
jessie_backport

00:02:10

failed #438
stretch

00:05:49

 
Name Stage Failure
failed
stretch Test There is an unknown failure, please try again
  File "/builds/adrien/acme-dns-tiny/tests/test_acme_dns_tiny.py", line 45, in assertCertificateChain
self.assertEqual(3, len(certlist))
AssertionError: 3 != 1

----------------------------------------------------------------------
Ran 14 tests in 90.501s

FAILED (failures=3, errors=4)
ERROR: Job failed: exit code 1
failed
jessie_backport Test There is an unknown failure, please try again
  File "/builds/adrien/acme-dns-tiny/tests/test_acme_dns_tiny.py", line 45, in assertCertificateChain
self.assertEqual(3, len(certlist))
AssertionError: 3 != 1

----------------------------------------------------------------------
Ran 14 tests in 82.693s

FAILED (failures=3, errors=4)
ERROR: Job failed: exit code 1
failed
jessie Test There is an unknown failure, please try again
  File "/builds/adrien/acme-dns-tiny/tests/test_acme_dns_tiny.py", line 45, in assertCertificateChain
self.assertEqual(3, len(certlist))
AssertionError: 3 != 1

----------------------------------------------------------------------
Ran 14 tests in 79.541s

FAILED (failures=3, errors=4)
ERROR: Job failed: exit code 1