Fixing race conditions in the code base (#5966)

* Adding initial race detector

* Remove setting of config twice

* Fixing config file watch and config reload on license save

* Fixing config file watch and config reload on license save

* Fixing build error

* Fixing locking issue

* Fixing makefile

* Fixing race in config

* Fixing race in status unit test

* Adding EE race tests

* Fixing race in cluster info

* Removing code that's isn't needed

* Fixing some more races

* Fixing govet issue

glide.yaml

@@ -2,6 +2,7 @@ package: github.com/mattermost/platform
 import:
 - package: github.com/NYTimes/gziphandler
 - package: github.com/alecthomas/log4go
+  repo: https://github.com/mattermost/log4go.git
 - package: github.com/dgryski/dgoogauth
 - package: github.com/disintegration/imaging
   version: v1.0.0