Update docker base image

This covers quite a few important change

1. We updated maxmind db
2. We upgraded redis to version 5
3. It forces a rebuild for important nginx changes
4. It updates all gems, a ton got updated, this speeds up rebuild

Author: SamSaffron

launcher

@@ -80,7 +80,7 @@ git_rec_version='1.8.0'
 config_file=containers/"$config".yml
 cidbootstrap=cids/"$config"_bootstrap.cid
 local_discourse=local_discourse
-image=discourse/base:2.0.20181031
+image=discourse/base:2.0.20190217
 docker_path=`which docker.io || which docker`
 git_path=`which git`