Remove kubeadm pull images

[priyawadhwa]

Since we pull and load all of these images already, we shouldn't need to do it again.

[k8s-ci-robot]

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[tstromberg]

/ok-to-test

[tstromberg]

cmd/minikube/cmd/start.go:1299:121: `bootstrapCluster` - `preexisting` is unused (unparam)

[minikube-pr-bot]

Error: running mkcmp: exit status 1

[medyagh]

seems harmless ! except the lint :)

[medyagh]

looks good thank you (after fixing the lint )

[codecov-io]

Codecov Report

Merging #6514 into master will increase coverage by 0.03%.
The diff coverage is 40%.

@@            Coverage Diff             @@
##           master    #6514      +/-   ##
==========================================
+ Coverage   37.95%   37.99%   +0.03%     
==========================================
  Files         138      138              
  Lines        8708     8673      -35     
==========================================
- Hits         3305     3295      -10     
+ Misses       4986     4966      -20     
+ Partials      417      412       -5

Impacted Files	Coverage Δ
pkg/minikube/bootstrapper/bootstrapper.go	0% <ø> (ø)	⬆️
cmd/minikube/cmd/start.go	21.98% <40%> (-0.32%)	⬇️

[minikube-pr-bot]

All Times minikube: [ 92.541867 94.855101 91.010794]
All Times Minikube (PR 6514): [ 95.990387 92.378526 92.436203]

Average minikube: 92.802587
Average Minikube (PR 6514): 93.601705

Averages Time Per Log

+----------------------+-----------+--------------------+
|         LOG          | MINIKUBE  | MINIKUBE (PR 6514) |
+----------------------+-----------+--------------------+
| minikube v           |  0.132622 |           0.122999 |
| Creating kvm2        | 19.814765 |          20.227490 |
| Preparing Kubernetes | 48.429546 |          49.544504 |
| Pulling images       |  3.340484 |                    |
| Launching Kubernetes | 19.434305 |          21.078136 |
| Waiting for cluster  |  0.052527 |           0.078927 |
+----------------------+-----------+--------------------+

[minikube-pr-bot]

All Times minikube: [ 95.098037 96.543079 94.666911]
All Times Minikube (PR 6514): [ 93.302036 91.164798 90.660122]

Average minikube: 95.436009
Average Minikube (PR 6514): 91.708985

Averages Time Per Log

+----------------------+-----------+--------------------+
|         LOG          | MINIKUBE  | MINIKUBE (PR 6514) |
+----------------------+-----------+--------------------+
| minikube v           |  0.133602 |           0.123408 |
| Creating kvm2        | 20.056048 |          19.760522 |
| Preparing Kubernetes | 49.155302 |          49.089956 |
| Pulling images       |  4.001644 |                    |
| Launching Kubernetes | 19.873548 |          20.965838 |
| Waiting for cluster  |  0.242812 |           0.066083 |
+----------------------+-----------+--------------------+