Upgrade templates to support OCP 3.6 (#642)

* Prep for 3.6 ocp/7.4 rhel spike

* Revert to 7.3

* Fix disk size on osdisk

* Fix size

* Add auto resize

* Fixup grow code to be cleaner and make sure docker is auto installed

* Make sure docker is started and enabled

* First pass move to 3.6 for HA Deployment

* Setup test

* Fix up installs

* Implement auto root device detection

* Move to new full auto growfs for root

* Prepare for upstream merge

* Implement new directory structure for multiple versions

* Add version support in allinone

* Fix template path on version

* Switch back to production

* Cleanup ansibledeployocp

* Re-add