Co-Authored-By: caoyuan <cao.yuan@99cloud.net> Change-Id: I3cea0677379773d1426cfd314bead5e58e5c825f 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