PLT-6408 Framework for job server (#6404)

* Added initial job server

* Added job server to be ran as part of platform

* Added test job to the enterprise repo

* Fixed job server not loading license

* Renamed job package to jobs

* Fixed TE not being buildable

* Added JobStatus table to database

* Changed fields used by JobStatus

* Added APIs to query job status

* Added config change listener to server

* Added option to run job server from Makefile

* Added ability to enable/disable jobs from config

* Commented out placeholder for search indexing job

* Fixed govet

* Removed debug messages and fixed job api init message

jobs/server.go

@@ -0,0 +1,46 @@
+// Copyright (c) 2017-present Mattermost, Inc. All Rights Reserved.
+// See License.txt for license information.
+
+package jobs
+
+import (
+	l4g "github.com/alecthomas/log4go"
+	"github.com/mattermost/platform/model"
+	"github.com/mattermost/platform/store"
+	"github.com/mattermost/platform/utils"
+)
+
+type JobServer struct {
+	Store store.Store
+	Jobs  *Jobs
+}
+
+func (server *JobServer) LoadLicense() {
+	licenseId := ""
+	if result := <-server.Store.System().Get(); result.Err == nil {
+		props := result.Data.(model.StringMap)
+		licenseId = props[model.SYSTEM_ACTIVE_LICENSE_ID]
+	}
+
+	var licenseBytes []byte
+
+	if len(licenseId) != 26 {
+		// Lets attempt to load the file from disk since it was missing from the DB
+		_, licenseBytes = utils.GetAndValidateLicenseFileFromDisk()
+	} else {
+		if result := <-server.Store.License().Get(licenseId); result.Err == nil {
+			record := result.Data.(*model.LicenseRecord)
+			licenseBytes = []byte(record.Bytes)
+			l4g.Info("License key valid unlocking enterprise features.")
+		} else {
+			l4g.Info(utils.T("mattermost.load_license.find.warn"))
+		}
+	}
+
+	if licenseBytes != nil {
+		utils.LoadLicense(licenseBytes)
+		l4g.Info("License key valid unlocking enterprise features.")
+	} else {
+		l4g.Info(utils.T("mattermost.load_license.find.warn"))
+	}
+}