Move to vendor

Signed-off-by: Olivier Gambier <olivier@docker.com>

vendor/github.com/bugsnag/bugsnag-go/doc.go

@@ -0,0 +1,69 @@
+/*
+Package bugsnag captures errors in real-time and reports them to Bugsnag (http://bugsnag.com).
+
+Using bugsnag-go is a three-step process.
+
+1. As early as possible in your program configure the notifier with your APIKey. This sets up
+handling of panics that would otherwise crash your app.
+
+	func init() {
+		bugsnag.Configure(bugsnag.Configuration{
+			APIKey: "YOUR_API_KEY_HERE",
+		})
+	}
+
+2. Add bugsnag to places that already catch panics. For example you should add it to the HTTP server
+when you call ListenAndServer:
+
+	http.ListenAndServe(":8080", bugsnag.Handler(nil))
+
+If that's not possible, for example because you're using Google App Engine, you can also wrap each
+HTTP handler manually:
+
+	http.HandleFunc("/" bugsnag.HandlerFunc(func (w http.ResponseWriter, r *http.Request) {
+		...
+	})
+
+3. To notify Bugsnag of an error that is not a panic, pass it to bugsnag.Notify. This will also
+log the error message using the configured Logger.
+
+	if err != nil {
+		bugsnag.Notify(err)
+	}
+
+For detailed integration instructions see https://bugsnag.com/docs/notifiers/go.
+
+Configuration
+
+The only required configuration is the Bugsnag API key which can be obtained by clicking "Settings"
+on the top of https://bugsnag.com/ after signing up. We also recommend you set the ReleaseStage
+and AppVersion if these make sense for your deployment workflow.
+
+RawData
+
+If you need to attach extra data to Bugsnag notifications you can do that using
+the rawData mechanism.  Most of the functions that send errors to Bugsnag allow
+you to pass in any number of interface{} values as rawData. The rawData can
+consist of the Severity, Context, User or MetaData types listed below, and
+there is also builtin support for *http.Requests.
+
+	bugsnag.Notify(err, bugsnag.SeverityError)
+
+If you want to add custom tabs to your bugsnag dashboard you can pass any value in as rawData,
+and then process it into the event's metadata using a bugsnag.OnBeforeNotify() hook.
+
+	bugsnag.Notify(err, account)
+
+	bugsnag.OnBeforeNotify(func (e *bugsnag.Event, c *bugsnag.Configuration) {
+		for datum := range e.RawData {
+			if account, ok := datum.(Account); ok {
+				e.MetaData.Add("account", "name", account.Name)
+				e.MetaData.Add("account", "url", account.URL)
+			}
+		}
+	})
+
+If necessary you can pass Configuration in as rawData, or modify the Configuration object passed
+into OnBeforeNotify hooks. Configuration passed in this way only affects the current notification.
+*/
+package bugsnag