Use preloaded tarball for VMs as well

[priyawadhwa]

Since preloaded tarballs are container runtime specific, I added a Preload() func
to the cruntime interface. To use it with VMs, the tarball is first
copied into the VM and then extracted. The leftover tarball is deleted,
and the container runtime (currently only docker is supported) is
restarted.

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: priyawadhwa

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Needs approval from an approver in each of these files:

• OWNERS [priyawadhwa]

Approvers can indicate their approval by writing /approve in a comment
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[TravisBuddy]

Travis tests have failed

Hey @priyawadhwa,
Please read the following log in order to understand the failure reason.
It'll be awesome if you fix what's wrong and commit the changes.

TravisBuddy Request Identifier: 614b3760-5f16-11ea-9418-d96fb954c76d

[priyawadhwa]

/ok-to-test

[minikube-pr-bot]

Error: running mkcmp: exit status 1

[minikube-pr-bot]

All Times minikube: [ 92.092458 94.467348 93.096812]
All Times Minikube (PR 6898): [ 100.579416 98.851705 99.814473]

Average minikube: 93.218873
Average Minikube (PR 6898): 99.748532

Averages Time Per Log

+----------------------+-----------+--------------------+
|         LOG          | MINIKUBE  | MINIKUBE (PR 6898) |
+----------------------+-----------+--------------------+
| minikube v           |  0.201396 |           0.219923 |
| Creating kvm2        | 20.318584 |          15.394298 |
| Preparing Kubernetes | 50.308962 |          53.376727 |
| Pulling images       |           |                    |
| Launching Kubernetes | 21.028251 |          20.635345 |
| Waiting for cluster  |  0.081244 |           0.063602 |
+----------------------+-----------+--------------------+

[minikube-pr-bot]

All Times minikube: [ 94.242589 89.956610 92.616504]
All Times Minikube (PR 6898): [ 97.388704 100.073280 96.997989]

Average minikube: 92.271901
Average Minikube (PR 6898): 98.153324

Averages Time Per Log

+----------------------+-----------+--------------------+
|         LOG          | MINIKUBE  | MINIKUBE (PR 6898) |
+----------------------+-----------+--------------------+
| minikube v           |  0.206392 |           0.221772 |
| Creating kvm2        | 19.674527 |          23.635615 |
| Preparing Kubernetes | 49.606402 |          50.366116 |
| Pulling images       |           |                    |
| Launching Kubernetes | 21.194019 |          21.098713 |
| Waiting for cluster  |  0.056212 |           0.063058 |
+----------------------+-----------+--------------------+

[tstromberg]

Approved assuming integration tests look reasonable.

[minikube-pr-bot]

All Times minikube: [ 95.942146 92.820578 95.622671]
All Times Minikube (PR 6898): [ 97.538867 97.261533 96.179786]

Average minikube: 94.795132
Average Minikube (PR 6898): 96.993395

Averages Time Per Log

+----------------------+-----------+--------------------+
|         LOG          | MINIKUBE  | MINIKUBE (PR 6898) |
+----------------------+-----------+--------------------+
| minikube v           |  0.222268 |           0.222072 |
| Creating kvm2        | 20.530715 |          22.863609 |
| Preparing Kubernetes | 50.496763 |          50.353372 |
| Pulling images       |           |                    |
| Launching Kubernetes | 22.122011 |          20.218576 |
| Waiting for cluster  |  0.056234 |           0.070332 |
+----------------------+-----------+--------------------+

[codecov-io]

Codecov Report

Merging #6898 into master will decrease coverage by 0.09%.
The diff coverage is 0%.

@@            Coverage Diff            @@
##           master    #6898     +/-   ##
=========================================
- Coverage   37.11%   37.02%   -0.1%     
=========================================
  Files         144      144             
  Lines        8955     9010     +55     
=========================================
+ Hits         3324     3336     +12     
- Misses       5212     5251     +39     
- Partials      419      423      +4

Impacted Files	Coverage Δ
pkg/minikube/cruntime/cruntime.go	57.5% <ø> (ø)	⬆️
pkg/minikube/cruntime/containerd.go	44.54% <0%> (-0.83%)	⬇️
pkg/minikube/cruntime/crio.go	52.04% <0%> (-1.09%)	⬇️
pkg/minikube/cruntime/docker.go	36.55% <0%> (-5.85%)	⬇️
cmd/minikube/cmd/start.go	32.54% <0%> (+0.37%)	⬆️

[minikube-pr-bot]

All Times minikube: [ 92.242851 95.248294 94.366230]
All Times Minikube (PR 6898): [ 97.548586 97.311726 97.609632]

Average minikube: 93.952459
Average Minikube (PR 6898): 97.489981

Averages Time Per Log

+----------------------+-----------+--------------------+
|         LOG          | MINIKUBE  | MINIKUBE (PR 6898) |
+----------------------+-----------+--------------------+
| minikube v           |  0.528522 |           0.207082 |
| Creating kvm2        | 20.163713 |          23.056620 |
| Preparing Kubernetes | 50.138505 |          49.502834 |
| Pulling images       |           |                    |
| Launching Kubernetes | 21.800341 |          21.914536 |
| Waiting for cluster  |  0.054175 |           0.071196 |
+----------------------+-----------+--------------------+

[medyagh]

Looks good, please feel free to merge if tested manually on VM