openshift.ks: enable watchman on node install

https://trello.com/c/vze60jtU/193-3-oo-install-openshift-sh-work-for-2-1

Adds `chkconfig openshift-watchman on` to `enable_services_on_node` function
Merge pull request #317 from dobbymoodge/watchman

openshift.ks: enable watchman on node install