ejabberd: Add support for external authentication cache

ejabberd/manifests/init.pp

@@ -24,6 +24,10 @@
 # $extauth:
 #   Path to external authentication command.
 #
+# $extauth_cache:
+#   Number of seconds that ejabberd can cache external authentication
+#   information. Disabled by default.
+#
 # $muclog_datadir:
 #   Path where to store chatroom logs. Disabled by default.
 #
@@ -68,6 +72,7 @@ class ejabberd(
   $webhosts=undef,
   $auth='internal',
   $extauth=undef,
+  $extauth_cache=false,
   $muclog_datadir=undef,
   $muclog_format='plaintext',
   $ssl_key="${::puppet_ssldir}/private_keys/${::homename}.pem",