Health check previously configured driver & exit if not installed

[tstromberg]

Currently we warn about unhealthy drivers only if specified via --vm-driver.

This PR extends that health check to the case where we determine which driver from an existing profile. It also displays what alternative drivers are available, even when a driver is explicitly specified.

Old behavior

😄  minikube v1.5.2 on Debian rodete
💡  Tip: Use 'minikube start -p <name>' to create a new cluster, or 'minikube delete' to delete this one.
🔄  Retriable failure: Error getting state for host: VBoxManage not found. Make sure VirtualBox is installed and VBoxManage is in the path
⚠️  Unable to get the status of the minikube cluster.
💡  Tip: Use 'minikube start -p <name>' to create a new cluster, or 'minikube delete' to delete this one.
🔄  Retriable failure: Error getting state for host: VBoxManage not found. Make sure VirtualBox is installed and VBoxManage is in the path
⚠️  Unable to get the status of the minikube cluster.
💡  Tip: Use 'minikube start -p <name>' to create a new cluster, or 'minikube delete' to delete this one.
<retry loop>

New behavior

😄  minikube v1.5.2 on Debian rodete
✨  Selecting 'virtualbox' driver from existing profile (alternates: [kvm2 none])

⚠️  'virtualbox' driver reported an issue: unable to find VBoxManage in $PATH
💡  Suggestion: Install VirtualBox
📘  Documentation: https://minikube.sigs.k8s.io/docs/reference/drivers/virtualbox/

💣  virtualbox does not appear to be installed, but is specified by an existing profile. Please run 'minikube delete' or install virtualbox
<exit!>

Fixes #5838 #5821

[k8s-ci-robot]

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This pull-request has been approved by: tstromberg

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[codecov-io]

Codecov Report

Merging #5840 into master will increase coverage by 0.05%.
The diff coverage is 31.74%.

@@            Coverage Diff             @@
##           master    #5840      +/-   ##
==========================================
+ Coverage   36.49%   36.55%   +0.05%     
==========================================
  Files         110      110              
  Lines        8124     8141      +17     
==========================================
+ Hits         2965     2976      +11     
- Misses       4770     4776       +6     
  Partials      389      389

Impacted Files	Coverage Δ
pkg/minikube/registry/registry.go	100% <ø> (ø)	⬆️
cmd/minikube/cmd/start.go	19.56% <0%> (-0.21%)	⬇️
pkg/minikube/registry/global.go	86.66% <100%> (+12.59%)	⬆️
pkg/minikube/driver/driver.go	92.59% <85.71%> (-3.16%)	⬇️

[sharifelgamal]

/ok-to-test

[minikube-bot]

Error: running mkcmp: exit status 1

[minikube-bot]

Error: building minikube at head: updating minikube master branch: running [git pull origin master] in /home/performance-monitor/minikube:
From https://github.com/kubernetes/minikube

• branch master -> FETCH_HEAD
  error: Your local changes to the following files would be overwritten by merge:
  go.mod
  Please commit your changes or stash them before you merge.
  Aborting
  Updating 9de78fd..f773c4b
  : exit status 1

[minikube-bot]

All Times Minikube (PR 5840): [ 195.384340 185.791113 182.379482]
All Times minikube: [ 176.580031 176.506973 176.930368]

Average Minikube (PR 5840): 187.851645
Average minikube: 176.672457

Averages Time Per Log

+------------------------+-----------+--------------------+
|          LOG           | MINIKUBE  | MINIKUBE (PR 5840) |
+------------------------+-----------+--------------------+
| minikube v             |  0.315525 |           0.307227 |
| Creating kvm2          | 39.329364 |          38.074358 |
| Preparing Kubernetes   | 53.184384 |          52.977926 |
| Pulling images         |  2.937444 |           3.054512 |
| Launching Kubernetes   | 20.185108 |          19.341825 |
| Waiting for: apiserver | 60.720632 |          74.052914 |
+------------------------+-----------+--------------------+

[minikube-bot]

All Times minikube: [ 175.775262 196.723275 182.969365]
All Times Minikube (PR 5840): [ 187.199634 169.343577 187.137658]

Average minikube: 185.155968
Average Minikube (PR 5840): 181.226956

Averages Time Per Log

+------------------------+-----------+--------------------+
|          LOG           | MINIKUBE  | MINIKUBE (PR 5840) |
+------------------------+-----------+--------------------+
| minikube v             |  0.334295 |           0.301561 |
| Creating kvm2          | 38.094644 |          37.904998 |
| Preparing Kubernetes   | 53.293536 |          52.360820 |
| Pulling images         |  3.045179 |           2.897449 |
| Launching Kubernetes   | 19.663534 |          20.827511 |
| Waiting for: apiserver | 70.724781 |          66.891333 |
+------------------------+-----------+--------------------+