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

8161851 fix partition removal for ceph nautilus
be9d88f Remove tmp:tmp mount for tempest tests
acc7d28 Retry dist-upgrades
c05da4c Add correct salt minions update
2ce3c94 Revert "Run salt.minion and full refresh consistently"

Change-Id: Id373a601d1796edee1c1486f1ae6fbd86175815d