Bump default Kubernetes version to v1.17.3

[tstromberg]

No description provided.

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: tstromberg

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[tstromberg]

/ok-to-test

[minikube-pr-bot]

All Times minikube: [ 92.409863 92.923455 95.911672]
All Times Minikube (PR 6602): [ 97.619784 91.633516 91.530692]

Average minikube: 93.748330
Average Minikube (PR 6602): 93.594664

Averages Time Per Log

+----------------------+-----------+--------------------+
|         LOG          | MINIKUBE  | MINIKUBE (PR 6602) |
+----------------------+-----------+--------------------+
| minikube v           |  0.205580 |           0.205177 |
| Creating kvm2        | 20.159484 |          20.136078 |
| Preparing Kubernetes | 50.672322 |          50.007094 |
| Pulling images       |           |                    |
| Launching Kubernetes | 20.599571 |          20.620215 |
| Waiting for cluster  |  0.063578 |           0.222402 |
+----------------------+-----------+--------------------+

[codecov-io]

Codecov Report

Merging #6602 into master will decrease coverage by 0.05%.
The diff coverage is 34.75%.

@@            Coverage Diff             @@
##           master    #6602      +/-   ##
==========================================
- Coverage   37.56%   37.51%   -0.06%     
==========================================
  Files         138      138              
  Lines        8779     8792      +13     
==========================================
  Hits         3298     3298              
- Misses       5065     5080      +15     
+ Partials      416      414       -2

Impacted Files	Coverage Δ
pkg/minikube/registry/registry.go	100% <ø> (ø)	⬆️
pkg/minikube/driver/driver_linux.go	0% <ø> (ø)	⬆️
pkg/minikube/command/kic_runner.go	0% <0%> (ø)	⬆️
cmd/minikube/cmd/stop.go	0% <0%> (ø)	⬆️
pkg/minikube/driver/driver.go	57.5% <0%> (-3.03%)	⬇️
cmd/minikube/cmd/kubectl.go	0% <0%> (ø)	⬆️
cmd/minikube/cmd/update-context.go	0% <0%> (ø)	⬆️
cmd/minikube/cmd/config/profile.go	0% <0%> (ø)	⬆️
pkg/minikube/cluster/ip.go	0% <0%> (ø)	⬆️
pkg/minikube/machine/cache_images.go	0% <0%> (ø)	⬆️
... and 19 more

[minikube-pr-bot]

All Times minikube: [ 92.889285 90.210328 92.191247]
All Times Minikube (PR 6602): [ 94.408483 92.560839 95.404556]

Average Minikube (PR 6602): 94.124626
Average minikube: 91.763620

Averages Time Per Log

+----------------------+-----------+--------------------+
|         LOG          | MINIKUBE  | MINIKUBE (PR 6602) |
+----------------------+-----------+--------------------+
| minikube v           |  0.204710 |           0.199167 |
| Creating kvm2        | 19.654594 |          20.139061 |
| Preparing Kubernetes | 49.552191 |          51.138053 |
| Pulling images       |           |                    |
| Launching Kubernetes | 20.627937 |          20.622489 |
| Waiting for cluster  |  0.046776 |           0.220453 |
+----------------------+-----------+--------------------+

[tstromberg]

/ok-to-test