Change import path for social since it has moved

pkg/api/pluginproxy/ds_proxy.go

@@ -18,10 +18,10 @@ import (
 
 	"github.com/grafana/grafana/pkg/bus"
 	"github.com/grafana/grafana/pkg/log"
+	"github.com/grafana/grafana/pkg/login/social"
 	m "github.com/grafana/grafana/pkg/models"
 	"github.com/grafana/grafana/pkg/plugins"
 	"github.com/grafana/grafana/pkg/setting"
-	"github.com/grafana/grafana/pkg/social"
 	"github.com/grafana/grafana/pkg/util"
 )