Add fast-path for restarting a cluster when the configuration is unchanged

[tstromberg]

If the specified configuration is identical to the current configuration:

• If VM is running, skip setup and block until pods are healthy. This should be instantanteous.
• If VM is not running, start VM, reconfigure any IP's necessary, and block until pods are healthy.

#3293 was trying to solve this, but the logic to assert that the configuration was the same was never implemented. I feel that this would be a huge performance benefit for our users.

[tstromberg]

Deferring for another release. Doing a prototype, I find that at best there is currently 20% savings for VM's not running, though a lot of savings if there is not.

One problem is that stopped VM's are rebooted at start :( I'm not sure if this is limited to libmachine or not.

[medyagh]

having pause command will make the need to stop minikube less often

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[tstromberg]

Fixed.