Allow configuration of Gerrit httpd.maxQueued option

Allow puppet to configure the Gerrit 2.11 httpd.maxQueued[1]
option.

[1] https://gerrit-documentation.storage.googleapis.com/
       Documentation/2.11/config-gerrit.html#httpd.maxQueued

Change-Id: Iea202fcfe7af4a9d5b4c3a360124c24649b1133b

manifests/init.pp

@@ -53,6 +53,7 @@
 #   httpd_acceptorthreads:
 #   httpd_minthreads:
 #   httpd_maxthreads:
+#   httpd_maxqueued:
 #   httpd_maxwait:
 #     Gerrit configuration options; see Gerrit docs.
 #   commentlinks:
@@ -176,6 +177,7 @@ class gerrit(
   $httpd_acceptorthreads = '',
   $httpd_minthreads = '',
   $httpd_maxthreads = '',
+  $httpd_maxqueued = '',
   $httpd_maxwait = '',
   $commentlinks = [],
   $trackingids = [],
@@ -368,6 +370,7 @@ class gerrit(
   # - $httpd_acceptorthreads
   # - $httpd_minthreads
   # - $httpd_maxthreads
+  # - $httpd_maxqueued
   # - $commentlinks
   # - $trackingids
   # - $enable_melody

templates/gerrit.config.erb

@@ -100,6 +100,9 @@
 <% if @httpd_maxthreads != "" -%>
 	maxThreads = <%= @httpd_maxthreads %>
 <% end -%>
+<% if @httpd_maxqueued != "" -%>
+	maxQueued = <%= @httpd_maxqueued %>
+<% end -%>
 [cache]
 	directory = cache
 [cache "web_sessions"]