Round suggested memory alloc by 100MB for VM's

[tstromberg]

Fixes #6964

There are now loads of tests, but here is a log from an example run:

I0310 16:00:45.581333 12309 start.go:870] Using suggested 6000MB memory alloc based on sys=32768MB, container=0MB

[k8s-ci-robot]

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[tstromberg]

/ok-to-test

[minikube-pr-bot]

Error: running mkcmp: exit status 1

[medyagh]

/ok-to-test

[medyagh]

Unit test:

ERROR: logging before flag.Parse: I0310 23:10:19.830429   11737 translate.go:92] Setting Language to en-US ...
E0310 23:10:23.501919   11737 out.go:95] [unset errFile]: ! Not passing HTTP_PROXY=127.0.0.1:3128 to docker env.
E0310 23:10:23.502235   11737 out.go:95] [unset errFile]: X Invalid size passed in argument: invalid size: ''

[minikube-pr-bot]

All Times minikube: [ 64.239642 61.497723 66.504116]
All Times Minikube (PR 6987): [ 64.386485 65.495149 66.055794]

Average minikube: 64.080494
Average Minikube (PR 6987): 65.312476

Averages Time Per Log

+----------------------+-----------+--------------------+
|         LOG          | MINIKUBE  | MINIKUBE (PR 6987) |
+----------------------+-----------+--------------------+
| minikube v           |  0.221953 |           0.324666 |
| Creating kvm2        | 40.689888 |          39.762151 |
| Preparing Kubernetes |  0.785908 |           0.778984 |
| Pulling images       |           |                    |
| Launching Kubernetes | 19.247547 |          21.375057 |
| Waiting for cluster  |  0.059502 |           0.055201 |
+----------------------+-----------+--------------------+

[medyagh]

@tstromberg
unit test

ERROR: logging before flag.Parse: I0310 23:49:02.571270   11360 translate.go:92] Setting Language to en-US ...
E0310 23:49:08.942929   11360 out.go:95] [unset errFile]: ! Not passing HTTP_PROXY=127.0.0.1:3128 to docker env.
E0310 23:49:08.943451   11360 out.go:95] [unset errFile]: X Invalid size passed in argument: invalid size: ''
FAIL	k8s.io/minikube/cmd/minikube/cmd	6.456s

[tstromberg]

I removed a line I didn't think was required, but was. Made it so that CalculateSizeInMB returns an exit rather than errors to make it debuggable.

[minikube-pr-bot]

All Times Minikube (PR 6987): [ 66.226323 65.429023 66.518674]
All Times minikube: [ 63.850632 65.871421 65.708414]

Average minikube: 65.143489
Average Minikube (PR 6987): 66.058007

Averages Time Per Log

+----------------------+-----------+--------------------+
|         LOG          | MINIKUBE  | MINIKUBE (PR 6987) |
+----------------------+-----------+--------------------+
| minikube v           |  0.224629 |           0.219474 |
| Creating kvm2        | 41.587406 |          41.038224 |
| Preparing Kubernetes |  0.801696 |           0.781703 |
| Pulling images       |           |                    |
| Launching Kubernetes | 19.589378 |          21.179187 |
| Waiting for cluster  |  0.062582 |           0.067540 |
+----------------------+-----------+--------------------+

[medyagh]

The TestFunctional/parallel/CertSync on Docker driver is a new flake:

#6993

[medyagh]

TestStartStop/group/crio is a failing test not related to this PR:
#6996

[medyagh]

@tstromberg looks good to me, feel free to merge whenever you are ready.