Minor upgrade of Red Hat OpenStack Platform 13 fails and `docker ps` hangs

Issue

• Minor upgrade of Red Hat OpenStack Platform 13 fails and docker ps hangs after container upgrade and restart on at least one of the controllers.

• Red Hat OpenStack Platform upgrade from 12 to 13 fails and docker ps hangs after container upgrade and restart on at least one of the controllers.

Looking at the docker unit logs around the same time it locks up one can see:

Feb 05 12:14:26 controller02 dockerd-current[707739]: 2019/02/05 12:14:26 grpc: Server.processUnaryRPC failed to write status: stream error: code = 4 desc = "context deadline exceeded"
Feb 05 12:14:26 controller02 dockerd-current[707739]: 2019/02/05 12:14:26 grpc: Server.processUnaryRPC failed to write status: stream error: code = 4 desc = "context deadline exceeded"