def call() {
  return ['centos-6', 'centos-7', 'debian-9', 'debian-10', 'ubuntu-focal', 'ubuntu-bionic', 'rhel8']
}

def call() {
  return ['centos-7', 'debian-9', 'debian-10', 'ubuntu-focal', 'ubuntu-bionic', 'rhel8']
}

Delete Centos 6 from supported PDMDB OSes.
Delete Centos 6 from supported PDMDB OSes.
