replace dep with go modules (#16017)

- guide shamelessly stolen from prometheus/prometheus
- updates local interface of oauth exchange
- updates local impl of hclogger
- bump jaeger client version

closes #16088

pkg/login/social/social.go

@@ -29,7 +29,7 @@ type SocialConnector interface {
 	IsSignupAllowed() bool
 
 	AuthCodeURL(state string, opts ...oauth2.AuthCodeOption) string
-	Exchange(ctx context.Context, code string) (*oauth2.Token, error)
+	Exchange(ctx context.Context, code string, authOptions ...oauth2.AuthCodeOption) (*oauth2.Token, error)
 	Client(ctx context.Context, t *oauth2.Token) *http.Client
 	TokenSource(ctx context.Context, t *oauth2.Token) oauth2.TokenSource
 }

pkg/plugins/hclog-wrapper.go

@@ -1,6 +1,8 @@
 package plugins
 
 import (
+	"io"
+	"io/ioutil"
 	"log"
 
 	glog "github.com/grafana/grafana/pkg/log"
@@ -47,3 +49,10 @@ func (lw LogWrapper) ResetNamed(name string) hclog.Logger {
 func (lw LogWrapper) StandardLogger(ops *hclog.StandardLoggerOptions) *log.Logger {
 	return nil
 }
+
+func (lw LogWrapper) SetLevel(level hclog.Level) {}
+
+// Return a value that conforms to io.Writer, which can be passed into log.SetOutput()
+func (lw LogWrapper) StandardWriter(opts *hclog.StandardLoggerOptions) io.Writer {
+	return ioutil.Discard
+}