Increase Docker "slow" timeouts to 15s

[tstromberg]

Fixes #7193

How it appears in the UI:

❗  Executing "docker inspect -f {{.State.Status}} minikube" took an unusually long time: 4.7s
💡  Restarting the docker service may improve performance.

How it appears in logs when a command takes too long:

I0326 14:02:47.539046   85877 fix.go:105] recreateIfNeeded on minikube: state=Error err="docker inspect -f {{.State.Status}} minikube" timed out after 15s

[k8s-ci-robot]

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[tstromberg]

/ok-to-test

[minikube-pr-bot]

All Times minikube: [ 65.394817 61.743194 63.599114]
All Times Minikube (PR 7268): [ 65.501850 65.823783 61.540245]

Average minikube: 63.579042
Average Minikube (PR 7268): 64.288626

Averages Time Per Log

+----------------------+-----------+--------------------+
|         LOG          | MINIKUBE  | MINIKUBE (PR 7268) |
+----------------------+-----------+--------------------+
| minikube v           |  0.206425 |           0.207044 |
| Creating kvm2        | 39.965813 |          40.889064 |
| Preparing Kubernetes | 21.834722 |          21.587320 |
| Pulling images       |           |                    |
| Launching Kubernetes |           |                    |
| Waiting for cluster  |           |                    |
+----------------------+-----------+--------------------+

[medyagh]

are the go.sum changes legit ?