Change-Id: I0ae528e614aec65d4fee3044fff7036717a50376 Partially-implements: blueprint condition-pre-check
* Merge prechecks.yml and site.yml playbook * Create empty precheck.yml into all roles. Change-Id: I8a138558a26c0a2a66c5fd48ed37be657c99c1dd Implements: blueprint condition-pre-check