Merge the tip of origin/release/proposed/2019.2.0 into origin/release/2019.2.0

be5060d Refactor key-fetch
a7ae5c9 Add nginx state to master_config
2249f88 Fix wait for salt warm-up check
6090625 Add possibility not install updates

Change-Id: If77c648ed8ffa56c4f058c763e49ab01433f7248
tree: 9c4798378c089bd8b1ec9517fd2e801805eb27f6
  1. config-drive/
  2. mirror-image/
  3. predefine-vm/
  4. salt-ca/
  5. .gitreview