The patch adds _orchestrate.conf file to salt minion
configuration. Its template searches for "/meta/salt.yml"
file across all installed formulas and parses them if found.
As of now config will contain following data, e.g.:
orchestration:
  deploy:
    applications:
      cinder:
        priority: 150
      keystone:
        priority: 100

Application priorities will be used later for salt deploy
orchestration

Change-Id: I56b0d15e5a13ca4975d98b9675991f84885120e6
Related-PROD: PROD-19973

source:engine metadata created - defaults to pkg
installation, pip installation alternative added