Added NodeJS v6 jobs to check pipeline
Added NodeJS v6 jobs to check pipeline

Add nodejs v6 jobs initially to the check pipeline as non-voting.
No issues are expected but lets make it non-voting first

Change-Id: I737eaf69f5ea3c7bc8115d0d18a86faa9db8c1b9

openstack-infra/project-config,openstack-infra/project-config