Disable IPv6 in the minikube VM until it can be properly supported

[tstromberg]

Fixes #3963

With this change, the VM will no longer attempt to configure interfaces for IPv6 if the DHCP server provides one.

[k8s-ci-robot]

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[codecov-io]

Codecov Report

Merging #6241 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff           @@
##           master   #6241   +/-   ##
======================================
  Coverage    38.5%   38.5%           
======================================
  Files         122     122           
  Lines        8145    8145           
======================================
  Hits         3136    3136           
  Misses       4600    4600           
  Partials      409     409

[afbjorklund]

@tstromberg : should have been #3963

[tstromberg]

Thanks!

[tstromberg]

/ok-to-test

[minikube-bot]

Error: running mkcmp
2020/01/09 20:17:51 Executing run 1/3...
2020/01/09 20:17:51 Running: [/home/performance-monitor/minikube/out/minikube start]...
2020/01/09 20:17:51 0.482808: * minikube v1.6.2 on Debian 9.11
2020/01/09 20:17:51 0.052567: * Selecting 'kvm2' driver from user configuration (alternates: [none docker])
2020/01/09 20:18:38 47.114533: * Creating kvm2 VM (CPUs=2, Memory=2000MB, Disk=20000MB) ...
2020/01/09 20:19:29 51.046922: * Preparing Kubernetes v1.17.0 on Docker '19.03.5' ...
2020/01/09 20:19:31 1.959062: * Pulling images ...
2020/01/09 20:19:53 21.528114: * Launching Kubernetes ...
2020/01/09 20:19:56 3.050375: * Waiting for cluster to come online ...
2020/01/09 20:19:57 Running: [/home/performance-monitor/.minikube/minikube-binaries/6241/minikube start]...
2020/01/09 20:19:57 error deleting minikube: fork/exec /home/performance-monitor/.minikube/minikube-binaries/6241/minikube: exec format error
: exit status 1