Move node builder for linters to ubuntu1804

issue with python3 version using ubuntu16.04

Issue-ID: INT-1478

Signed-off-by: mrichomme <morgan.richomme@orange.com>
Change-Id: Ie2dbe1c7d89520194a2ed842e993fd0add0e32b9
Signed-off-by: mrichomme <morgan.richomme@orange.com>
1 file changed