Move salt based clusters to Docker 1.3.3

Part of #2896
Merge pull request #2898 from jbeda/docker-1.3.3

Move salt based clusters to Docker 1.3.3
Make multiple attempts to sanity check (GCE) and validate (ALL) cluster
Merge pull request #2816 from satnam6502/robust

Make multiple attempts to sanity check (GCE) and validate (ALL) cluster
Revert "Switch to the new home for go cover."
Merge pull request #2914 from GoogleCloudPlatform/revert-2866-build

Revert "Switch to the new home for go cover."
Rename Event.Status to Event.Condition to match v1beta3 agreement

Question - should this be a phase?  Seems like no, since phase implies
defined lifecycle and this field is explicitly not defined.