Structured logging (#8673)

* Implementing structured logging

* Changes to en.json to allow refactor to run.

* Fixing global logger

* Structured logger initalization.

* Add caller.

* Do some log redirection.

* Auto refactor

* Cleaning up l4g reference and removing dependancy.

* Removing junk.

* Copyright headers.

* Fixing tests

* Revert "Changes to en.json to allow refactor to run."

This reverts commit fd8249e99bcad0231e6ea65cd77c32aae9a54026.

* Fixing some auto refactor strangeness and typo.

* Making keys more human readable.

wsapi/status.go

@@ -4,8 +4,7 @@
 package wsapi
 
 import (
-	l4g "github.com/alecthomas/log4go"
-
+	"github.com/mattermost/mattermost-server/mlog"
 	"github.com/mattermost/mattermost-server/model"
 )
 
@@ -22,7 +21,7 @@ func (api *API) getStatuses(req *model.WebSocketRequest) (map[string]interface{}
 func (api *API) getStatusesByIds(req *model.WebSocketRequest) (map[string]interface{}, *model.AppError) {
 	var userIds []string
 	if userIds = model.ArrayFromInterface(req.Data["user_ids"]); len(userIds) == 0 {
-		l4g.Error(model.StringInterfaceToJson(req.Data))
+		mlog.Error(model.StringInterfaceToJson(req.Data))
 		return nil, NewInvalidWebSocketParamError(req.Action, "user_ids")
 	}