Switch linter jobs to ubuntu 18.04 minion by default

Change-Id: Iff7d58d164462770039f47411891b861fcf8029f
Issue-ID: INT-1478
Signed-off-by: Bartek Grzybowski <b.grzybowski@partner.samsung.com>
diff --git a/jjb/integration/integration-templates.yaml b/jjb/integration/integration-templates.yaml
index f4d101e..f5f3a1d 100644
--- a/jjb/integration/integration-templates.yaml
+++ b/jjb/integration/integration-templates.yaml
@@ -56,7 +56,7 @@
     name: '{project-name}-{stream}-{subproject}-lint'
     project-type: freestyle
     description: 'Job intended for running linters with Tox and Coala'
-    build-node: ubuntu1604-builder-2c-1g
+    build-node: ubuntu1804-builder-4c-4g
     node: '{build-node}'
 
     parameters: