puppet: Configure smokescreen for 14 days of logs, via logrotate.

supervisord's log rotation is only "every x bytes" which is not a good
enough policy for tracking auditing logs.  The default is also 10 logs
of 50MB, which is very much not enough for active instances.

Switch to tracking 14 days of daily logs.

puppet/zulip/files/logrotate/smokescreen

@@ -0,0 +1,11 @@
+/var/log/zulip/smokescreen.log
+{
+    missingok
+    rotate 14
+    daily
+    compress
+    delaycompress
+    notifempty
+    copytruncate
+    create 644 zulip zulip
+}

puppet/zulip/manifests/smokescreen.pp

@@ -49,4 +49,12 @@ class zulip::smokescreen {
     content => template('zulip/supervisor/smokescreen.conf.erb'),
     notify  => Service[supervisor],
   }
+
+  file { '/etc/logrotate.d/smokescreen':
+    ensure => file,
+    owner  => 'root',
+    group  => 'root',
+    mode   => '0644',
+    source => 'puppet:///modules/zulip/logrotate/smokescreen',
+  }
 }

puppet/zulip/templates/supervisor/smokescreen.conf.erb

@@ -6,3 +6,5 @@ autorestart=true
 user=zulip
 redirect_stderr=true
 stdout_logfile=/var/log/zulip/smokescreen.log
+stdout_logfile_maxbytes=0
+stdout_logfile_backups=0