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.

store/storetest/docker.go

@@ -12,8 +12,7 @@ import (
 	"strings"
 	"time"
 
-	l4g "github.com/alecthomas/log4go"
-
+	"github.com/mattermost/mattermost-server/mlog"
 	"github.com/mattermost/mattermost-server/model"
 )
 
@@ -31,7 +30,7 @@ type RunningContainer struct {
 }
 
 func (c *RunningContainer) Stop() error {
-	l4g.Info("Removing container: %v", c.Id)
+	mlog.Info(fmt.Sprintf("Removing container: %v", c.Id))
 	return exec.Command("docker", "rm", "-f", c.Id).Run()
 }
 
@@ -47,7 +46,7 @@ func NewMySQLContainer() (*RunningContainer, *model.SqlSettings, error) {
 	if err != nil {
 		return nil, nil, err
 	}
-	l4g.Info("Waiting for mysql connectivity")
+	mlog.Info("Waiting for mysql connectivity")
 	port := container.NetworkSettings.Ports["3306/tcp"][0].HostPort
 	if err := waitForPort(port); err != nil {
 		container.Stop()
@@ -66,7 +65,7 @@ func NewPostgreSQLContainer() (*RunningContainer, *model.SqlSettings, error) {
 	if err != nil {
 		return nil, nil, err
 	}
-	l4g.Info("Waiting for postgres connectivity")
+	mlog.Info("Waiting for postgres connectivity")
 	port := container.NetworkSettings.Ports["5432/tcp"][0].HostPort
 	if err := waitForPort(port); err != nil {
 		container.Stop()
@@ -111,7 +110,7 @@ func runContainer(args []string) (*RunningContainer, error) {
 		exec.Command("docker", "rm", "-f", id).Run()
 		return nil, err
 	}
-	l4g.Info("Running container: %v", id)
+	mlog.Info(fmt.Sprintf("Running container: %v", id))
 	return &RunningContainer{containers[0]}, nil
 }