preload: fix bug for windows file separators

[priyawadhwa]

should fix #6944

[codecov-io]

Codecov Report

Merging #6968 into master will decrease coverage by <.01%.
The diff coverage is 0%.

@@            Coverage Diff             @@
##           master    #6968      +/-   ##
==========================================
- Coverage      37%   36.99%   -0.01%     
==========================================
  Files         144      144              
  Lines        9013     9015       +2     
==========================================
  Hits         3335     3335              
- Misses       5256     5258       +2     
  Partials      422      422

Impacted Files	Coverage Δ
pkg/minikube/cruntime/docker.go	35.33% <0%> (-0.48%)	⬇️

[medyagh]

/ok-to-test

[minikube-pr-bot]

Error: running mkcmp: exit status 1

[minikube-pr-bot]

All Times minikube: [ 61.485357 62.234412 63.378993]
All Times Minikube (PR 6968): [ 63.399841 62.630348 60.272269]

Average minikube: 62.366254
Average Minikube (PR 6968): 62.100819

Averages Time Per Log

+----------------------+-----------+--------------------+
|         LOG          | MINIKUBE  | MINIKUBE (PR 6968) |
+----------------------+-----------+--------------------+
| minikube v           |  0.123214 |           0.123418 |
| Creating kvm2        | 39.842380 |          38.348948 |
| Preparing Kubernetes |  0.718783 |           0.706815 |
| Pulling images       |           |                    |
| Launching Kubernetes | 19.001200 |          19.893059 |
| Waiting for cluster  |  0.064250 |           0.064470 |
+----------------------+-----------+--------------------+

[afbjorklund]

/lgtm

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: afbjorklund, priyawadhwa

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