On IPv6 clusters, one of the most frequent problems I encounter is
assumptions that one can build a URL with a host and port simply by
using Sprintf, like this:
```go
fmt.Sprintf("http://%s:%d/foo", host, port)
```
When `host` is an IPv6 address, this produces an invalid URL as it must
be bracketed, like this:
```
http://[2001:4860:4860::8888]:9443
```
This change fixes the occurences of joining a host and port with the
purpose built `net.JoinHostPort` function.
I encounter this problem often enough that I started to [write a linter
for it](https://github.com/stbenjam/go-sprintf-host-port). I don't
think the linter is quite ready for wide use yet, but I did run it
against the Kube codebase and found these. While the host portion in
some of these changes may always be an FQDN or IPv4 IP today, it's an
easy thing that can break later on.
- Move from the old github.com/golang/glog to k8s.io/klog
- klog as explicit InitFlags() so we add them as necessary
- we update the other repositories that we vendor that made a similar
change from glog to klog
* github.com/kubernetes/repo-infra
* k8s.io/gengo/
* k8s.io/kube-openapi/
* github.com/google/cadvisor
- Entirely remove all references to glog
- Fix some tests by explicit InitFlags in their init() methods
Change-Id: I92db545ff36fcec83afe98f550c9e630098b3135
