FIX: discourse-setup MAXMIND works correctly

Ouch. This was worse than I thought.

Things fixed:

- consistent formatting (mostly that after `then` was indented by 4, not 2)
- fail if `DISCOURSE_MAXMIND_LICENSE_KEY` is not added to $web_file
- detect if `web_only.yml` exists 
- stop `web_only` if it exists rather than non-existing `app` (but why is it stopping it anyway?)
- don't try to `assert_maxmind_license_key` before `app.yml` exists

discourse-setup

@@ -185,7 +185,6 @@ check_disk_and_memory() {
     fi
   fi
 
-
   free_disk="$(df /var | tail -n 1 | awk '{print $4}')"
   if [ "$free_disk" -lt 5000 ]; then
     echo "WARNING: Discourse requires at least 5GB free disk space. This system"
@@ -317,11 +316,24 @@ read_default() {
 }
 
 assert_maxmind_license_key() {
-  if  ! grep DISCOURSE_MAXMIND_LICENSE_KEY $web_file
+  if  ! grep DISCOURSE_MAXMIND_LICENSE_KEY $web_file >/dev/null 2>&1
   then
     echo "Adding MAXMIND placeholder to $web_file"
     sed -i '/^.*LETSENCRYPT_ACCOUNT_EMAIL.*/a \ \ #DISCOURSE_MAXMIND_LICENSE_KEY: 1234567890123456' $web_file
   fi
+  if  ! grep DISCOURSE_MAXMIND_LICENSE_KEY $web_file >/dev/null 2>&1
+  then
+    cat <<EOF
+
+    Adding DISCOURSE_MAXMIND_LICENSE_KEY to $web_file has failed! This
+    indicates either that your $web_file is very old or otherwise not
+    what the script expects or that there is a bug in this script. The
+    best solution for a novice is to delete $web_file and start over.
+    An expert might prefer to edit $web_file by hand.
+
+EOF
+    read -p "Press return to continue or control-c to quit..."
+  fi
 }
 
 ##
@@ -711,7 +723,7 @@ validate_config() {
 ## template file names
 ##
 
-if [ "$1" == "2container" ]
+if [ "$1" == "2container" ] || [ -f containers/web_only.yml ]
 then
   app_name=web_only
   data_name=data
@@ -727,7 +739,7 @@ else
   web_file=containers/$app_name.yml
   data_file=containers/$app_name.yml
 fi
-    changelog=/tmp/changelog
+changelog=/tmp/changelog
 
 ##
 ## Check requirements before creating a copy of a config file we won't edit
@@ -735,7 +747,6 @@ fi
 check_root
 check_and_install_docker
 check_disk_and_memory
-assert_maxmind_license_key
 
 if [ -a "$web_file" ]
 then
@@ -750,7 +761,8 @@ then
   cp $web_file containers/$BACKUP
   echo "Stopping existing container in 5 seconds or Control-C to cancel."
   sleep 5
-  ./launcher stop app
+  assert_maxmind_license_key
+  ./launcher stop $app_name
   echo
 else
   check_ports