Allow puppet to configure Gerrit's canonicalGitUrl option

Gerrit 2.11 has a gerrit.canonicalWebUrl[1] option that will display
an alternative git repo location to users using the git protocol.

[1] https://review.openstack.org/Documentation/
          config-gerrit.html#gerrit.canonicalGitUrl

Change-Id: I5bd57d91b4d4a685328efe4d589a191debaa0fe5

manifests/init.pp

@@ -14,6 +14,8 @@
 #       eg., https://review.example.com/
 #   git_http_url:
 #     Optional base URL for repositories available over the HTTP protocol
+#   canonical_git_url:
+#     URL for repositories available over the anonymous git protocol
 #   ssl_cert_file:
 #   ssl_key_file:
 #     Used in the Apache virtual host to specify the SSL cert and key files.
@@ -130,6 +132,7 @@ class gerrit(
   $redirect_to_canonicalweburl = true,
   $canonicalweburl = "https://${::fqdn}/",
   $git_http_url = '',
+  $canonical_git_url = '',
   $robots_txt_source = '', # If left empty, the gerrit default will be used.
   $serveradmin = "webmaster@${::fqdn}",
   $ssl_cert_file = '/etc/ssl/certs/ssl-cert-snakeoil.pem',
@@ -342,6 +345,7 @@ class gerrit(
   # - $mysql_host
   # - $canonicalweburl
   # - $git_http_url
+  # - $canonical_git_url
   # - $smtpserver
   # - $sendemail_from
   # - $sendemail_include_diff

templates/gerrit.config.erb

@@ -10,6 +10,9 @@
 <% if @git_http_url != "" -%>
 	gitHttpUrl = <%= @git_http_url %>
 <% end -%>
+<% if @canonical_git_url != "" -%>
+	canonicalGitUrl = <%= @canonical_git_url %>
+<% end -%>
 [database]
 	type = MYSQL
 	hostname = <%= @mysql_host %>