Also cleanup the etcd data dir in jenkins.

This should fix some of the none driver issues with kubeadm.

We had some issues with mux/gorilla in our vendoring. This should fix it.

Signed-off-by: Nyanxuean <yan.xuean@zte.com.cn>

Convert registry to k8s.gcr.io

Update code-of-conduct.md

Refer to kubernetes/community as authoritative source for code of conduct

Updated to use new Minikube-maintained KVM driver

travis: update go version

1.9.x match latest patch version(1.9.2 today)

Also, this fixes the version output from `kubectl describe node`.
Now it shows:
```
[...]
System Info:
 Machine ID:                    41af387f4d4e4a3eabcdd2454a7e17f9
 System UUID:                   B5BA9F83-3476-4B4A-943A-81E7A3953234
 Boot ID:                       7e616123-fa50-4fa9-8f47-88b2a09fbb81
 Kernel Version:                4.9.13
 OS Image:                      Buildroot 2017.02
 Operating System:              linux
 Architecture:                  amd64
 Container Runtime Version:     cri-o://1.0.3
 Kubelet Version:               v1.8.0
 Kube-Proxy Version:            v1.8.0
[...]
```
Signed-off-by: NVincent Batts <vbatts@hashbangbash.com>

This builds the sysdig kernel module, but not the userspace
program. That can be provided by a container.