Fix the way 'minikube status' finds the kubecfg file.

[dlorenc]

No description provided.

[dlorenc]

I think this is why #1694 is currently failing.

[codecov-io]

Codecov Report

Merging #1736 into master will decrease coverage by 0.04%.
The diff coverage is 0%.

@@            Coverage Diff             @@
##           master    #1736      +/-   ##
==========================================
- Coverage   36.26%   36.22%   -0.05%     
==========================================
  Files          51       51              
  Lines        3367     3368       +1     
==========================================
- Hits         1221     1220       -1     
- Misses       1965     1967       +2     
  Partials      181      181

Impacted Files	Coverage Δ
cmd/minikube/cmd/start.go	14.21% <0%> (+0.32%)	⬆️
cmd/minikube/cmd/status.go	9.25% <0%> (ø)	⬆️
cmd/util/util.go	39.39% <0%> (-1.49%)	⬇️
pkg/util/kubeconfig/config.go	45.45% <0%> (-0.7%)	⬇️

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