Add more logging for integration test failures

Fix addon config

Wrap shell command in backquotes

`constants. AddonsPath` doesn't exist and isn't used by the example efk plugin. `constants.GuestAddonsDir` seems more appropriate. Docs are missing argument for whether or not plugin file is template.

This clarifies that `make out/minikube` is a shell command.

Integration de-flake: expand lock scopes, sync clock at creation

Update default Kubernetes release to v1.16.0-rc.2

Move update notification out of PersistentPreRun, improve update UI

Fine-tune integration test logging

Retire Kubernetes v1.10 support, update OldestKubernetesVersion to v1.11

Bump version to v1.4.0-beta.2

integration tests: Arbitrarily extend addon timeouts

Upgrade crio to 1.15.2

Due to issues with grpc in the previous version,
when running kubernetes v1.16.0-rc.1 with cri-o.

Sync default service versions for kubeadm v1.16

Add note for bare-metal driver

Refactor parallel integration tests for clarity and reliability