Fix inverted certificate symlink creation logic

[tstromberg]

Fixes #6577

Now includes integration tests so that we don't accidentally break this feature in the future.

[k8s-ci-robot]

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[tstromberg]

/ok-to-test

[medyagh]

thank you so so much for fixing and adding integration tests. looks good, feel free to merge after tests pass

[codecov-io]

Codecov Report

❗ No coverage uploaded for pull request base (master@aa91f39). Click here to learn what that means.
The diff coverage is 40%.

@@            Coverage Diff            @@
##             master    #6889   +/-   ##
=========================================
  Coverage          ?   38.23%           
=========================================
  Files             ?      142           
  Lines             ?     8766           
  Branches          ?        0           
=========================================
  Hits              ?     3352           
  Misses            ?     4993           
  Partials          ?      421

Impacted Files	Coverage Δ
pkg/minikube/command/ssh_runner.go	10.34% <0%> (ø)
pkg/minikube/bootstrapper/certs.go	75.24% <50%> (ø)

[minikube-pr-bot]

All Times minikube: [ 92.692821 92.621067 91.418588]
All Times Minikube (PR 6889): [ 92.355721 94.622897 92.497570]

Average minikube: 92.244159
Average Minikube (PR 6889): 93.158729

Averages Time Per Log

+----------------------+-----------+--------------------+
|         LOG          | MINIKUBE  | MINIKUBE (PR 6889) |
+----------------------+-----------+--------------------+
| minikube v           |  0.203859 |           0.213003 |
| Creating kvm2        | 20.129405 |          19.893777 |
| Preparing Kubernetes | 49.402722 |          50.228153 |
| Pulling images       |           |                    |
| Launching Kubernetes | 20.603579 |          21.183984 |
| Waiting for cluster  |  0.226106 |           0.056032 |
+----------------------+-----------+--------------------+

[medyagh]

not related to this PR but did we break the service cmd ? I see two failures in both VM and Kic