Added flags to purge configuration with minikube delete

[blueelvis]

Fixes #5358

[k8s-ci-robot]

Hi @blueelvis. Thanks for your PR.

I'm waiting for a kubernetes member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: blueelvis
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[TravisBuddy]

Travis tests have failed

Hey @blueelvis,
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.

1st Build

View build log

make test

which go-bindata || GO111MODULE=off GOBIN=/home/travis/gopath/bin go get github.com/jteeuwen/go-bindata/...
PATH="/home/travis/gopath/bin:/home/travis/.gimme/versions/go1.12.9.linux.amd64/bin:/home/travis/bin:/home/travis/bin:/home/travis/.local/bin:/usr/local/lib/jvm/openjdk11/bin:/opt/pyenv/shims:/home/travis/.phpenv/shims:/home/travis/perl5/perlbrew/bin:/home/travis/.nvm/versions/node/v8.12.0/bin:/home/travis/.rvm/gems/ruby-2.5.3/bin:/home/travis/.rvm/gems/ruby-2.5.3@global/bin:/home/travis/.rvm/rubies/ruby-2.5.3/bin:/home/travis/gopath/bin:/home/travis/.gimme/versions/go1.11.1.linux.amd64/bin:/usr/local/maven-3.6.0/bin:/usr/local/cmake-3.12.4/bin:/usr/local/clang-7.0.0/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/snap/bin:/home/travis/.rvm/bin:/home/travis/.phpenv/bin:/opt/pyenv/bin:/home/travis/.yarn/bin:/home/travis/gopath/bin" go-bindata -nomemcopy -o pkg/minikube/assets/assets.go -pkg assets deploy/addons/...
gofmt -s -w pkg/minikube/assets/assets.go
which go-bindata || GO111MODULE=off GOBIN=/home/travis/gopath/bin go get github.com/jteeuwen/go-bindata/...
/home/travis/gopath/bin/go-bindata
PATH="/home/travis/gopath/bin:/home/travis/.gimme/versions/go1.12.9.linux.amd64/bin:/home/travis/bin:/home/travis/bin:/home/travis/.local/bin:/usr/local/lib/jvm/openjdk11/bin:/opt/pyenv/shims:/home/travis/.phpenv/shims:/home/travis/perl5/perlbrew/bin:/home/travis/.nvm/versions/node/v8.12.0/bin:/home/travis/.rvm/gems/ruby-2.5.3/bin:/home/travis/.rvm/gems/ruby-2.5.3@global/bin:/home/travis/.rvm/rubies/ruby-2.5.3/bin:/home/travis/gopath/bin:/home/travis/.gimme/versions/go1.11.1.linux.amd64/bin:/usr/local/maven-3.6.0/bin:/usr/local/cmake-3.12.4/bin:/usr/local/clang-7.0.0/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/snap/bin:/home/travis/.rvm/bin:/home/travis/.phpenv/bin:/opt/pyenv/bin:/home/travis/.yarn/bin:/home/travis/gopath/bin" go-bindata -nomemcopy -o pkg/minikube/translate/translations.go -pkg translate translations/...
gofmt -s -w pkg/minikube/translate/translations.go
./test.sh
= make lint =============================================================
golangci/golangci-lint info checking GitHub for tag 'v1.18.0'
golangci/golangci-lint info found version: 1.18.0 for v1.18.0/linux/amd64
golangci/golangci-lint info installed out/linters/golangci-lint
cmd/minikube/cmd/delete.go:21: File is not `goimports`-ed (goimports)
	"fmt"
Makefile:335: recipe for target 'lint-ci' failed
make[1]: *** [lint-ci] Error 1
= go mod ================================================================
ok
Makefile:232: recipe for target 'test' failed
make: *** [test] Error 4

TravisBuddy Request Identifier: b1819960-e827-11e9-b0f4-939d566b92ab

[codecov-io]

Codecov Report

Merging #5548 into master will decrease coverage by 0.06%.
The diff coverage is 23.8%.

@@            Coverage Diff             @@
##           master    #5548      +/-   ##
==========================================
- Coverage    37.7%   37.64%   -0.07%     
==========================================
  Files         103      103              
  Lines        7617     7630      +13     
==========================================
  Hits         2872     2872              
- Misses       4368     4380      +12     
- Partials      377      378       +1

Impacted Files	Coverage Δ
cmd/minikube/cmd/delete.go	28.49% <22.22%> (-1.51%)	⬇️
pkg/minikube/cluster/cluster.go	37.82% <33.33%> (-0.3%)	⬇️

[RA489]

/ok-to-test