Change-Id: Ic2ad2b38d7e1c988f9dca9dc0d377cfee7b89504 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