v0.32.0 version bump

Make Kubernetes v1.12.4 the default

* Minor changes for compatibility with v1.13.1

* etcd subcommand should be local instead of all

Make "stop" retry on failure.

VirtualBox time cleanup: sync on boot, don't run timesyncd

tee party: Stream cmd output to tests when -v is enabled, and stream SSH output to logs

Decrease log noise by logging retry loops after the initial attempt

Disable vboxvideo and remove timesync-set-on-restore: neither work correctly w/ 5.1.x drivers in minikube

This reverts commit cbe5878e.

Document None driver docker compatibility

Use CRI socket from parameter for V1Alpha3 configs instead of hardcoded
dockershim path

Hide KVM signature when using GPU passthrough to support more GPU models

Allow ServiceCIDR to be configured via 'service-cluster-ip-range' flag.

clarified some steps in release instructions

adding priyawadhwa and tstromberg as maintainers

First try "kubeadm reset" without -f, primarily for older versions.

Extend Jenkins integration test timeout from 30m to 50m.

We've recently added TestFunctionalContainerd, which can take 10-15
minutes, pushing us over the edge in many cases.

For newer versions, it seems more pleasant anyways. This approach is at
least less ugly than parsing JSON from a shell script to version sniff.

* Save old cluster config in memory before overwriting

In PR #3426, I changed "minikube start" to overwrite the cluster config earlier so that the container runtime could be extracted from it by the buildroot provisioner. This introduced a bug later on, where minikube expected to read the kubernetes version from theold config (which no longer existed, because the config was overwritten).

To fix this, I changed the code to store the old version of the config in memory before overwriting it.

This should fix #3447