Migrate to dep (#3972)

* Update makefile to use dep

* Migrate to dep

* Fix some deps

* Try to find a better version for golang.org/x/net

* Try to find a better version for golang.org/x/oauth2

vendor/github.com/yohcop/openid-go/README.md

@@ -1,38 +0,0 @@
-# openid.go
-
-This is a consumer (Relying party) implementation of OpenId 2.0,
-written in Go.
-
-    go get -u github.com/yohcop/openid-go
-
-[![Build Status](https://travis-ci.org/yohcop/openid-go.svg?branch=master)](https://travis-ci.org/yohcop/openid-go)
-
-## Github
-
-Be awesome! Feel free to clone and use according to the licence.
-If you make a useful change that can benefit others, send a
-pull request! This ensures that one version has all the good stuff
-and doesn't fall behind.
-
-## Code example
-
-See `_example/` for a simple webserver using the openID
-implementation. Also, read the comment about the NonceStore towards
-the top of that file. The example must be run for the openid-go
-directory, like so:
-
-    go run _example/server.go
-
-## App Engine
-
-In order to use this on Google App Engine, you need to create an instance with a custom `*http.Client` provided by [urlfetch](https://cloud.google.com/appengine/docs/go/urlfetch/).
-
-```go
-oid := openid.NewOpenID(urlfetch.Client(appengine.NewContext(r)))
-oid.RedirectURL(...)
-oid.Verify(...)
-```
-
-## License
-
-Distributed under the [Apache v2.0 license](http://www.apache.org/licenses/LICENSE-2.0.html).

vendor/github.com/yohcop/openid-go/html_discovery.go

@@ -52,8 +52,6 @@ func findProviderFromHeadLink(input io.Reader) (opEndpoint, opLocalID string, er
 							provider = true
 						} else if attr.Val == "openid2.local_id" {
 							localID = true
-						} else if attr.Val == "openid.server" {
-							provider = true
 						}
 					} else if attr.Key == "href" {
 						href = attr.Val