install: Add experimental option to go straight through more install steps.

We'll make this the normal behavior soon, once we're satisfied with
our arrangements for sending the admin straight to realm creation and
using the app without configuring email.  The instructions in the docs
will also have to change accordingly, of course.

scripts/lib/install

@@ -16,7 +16,7 @@ EOF
 
 # Shell option parsing.  Over time, we'll want to move some of the
 # environment variables below into this self-documenting system.
-args="$(getopt -o '' --long help,self-signed-cert,certbot,hostname:,email: -n "$0" -- "$@")"
+args="$(getopt -o '' --long help,self-signed-cert,certbot,hostname:,email:,express -n "$0" -- "$@")"
 eval "set -- $args"
 while true; do
     case "$1" in
@@ -42,6 +42,10 @@ while true; do
             shift
             shift
             ;;
+        --express)  # experimental, not documented
+            EXPRESS_SETUP=1
+            shift
+            ;;
         --)
             shift
             break
@@ -279,8 +283,9 @@ if [ -e "/var/run/supervisor.sock" ]; then
     chown zulip:zulip /var/run/supervisor.sock
 fi
 
-set +x
-cat <<EOF
+if [ -z "$EXPRESS_SETUP" ]; then
+    set +x
+    cat <<EOF
 
  Installation complete!
 
@@ -292,3 +297,10 @@ cat <<EOF
 
  To configure the initial database.
 EOF
+    exit 0
+fi
+
+# TODO suppress instructions on success
+sudo -u zulip /home/zulip/deployments/current/scripts/setup/initialize-database
+
+sudo -u zulip /home/zulip/deployments/current/manage.py generate_realm_creation_link