Refactor to accept java_home from parent modules

The java_home is needed in review.pp and review-dev.pp (in
system-config) so instead of defining it in here allow a parent
module to pass in the value.

Change-Id: I5e817fab8a8973b688fd44dd819e3616df171321

manifests/init.pp

@@ -127,6 +127,8 @@
 #           'scheme'  => ['ssh', 'anon_http', 'anon_git'],
 #           'archive' => ['tar', 'tbz2', 'tgz', 'txz'],
 #       },
+#   java_home:
+#     The path to java home directory
 # TODO: make more gerrit options configurable here
 #
 class gerrit(
@@ -222,6 +224,7 @@ class gerrit(
   $cache_diff_timeout = '',
   $cache_diff_intraline_timeout = '',
   $download = {},
+  $java_home = '/usr/lib/jvm/java-7-openjdk-amd64/jre',
 ) {
   include ::httpd
 
@@ -230,11 +233,6 @@ class gerrit(
   }
   include ::pip
 
-  $java_home = $::lsbdistcodename ? {
-    'precise' => '/usr/lib/jvm/java-7-openjdk-amd64/jre',
-    'trusty'  => '/usr/lib/jvm/java-7-openjdk-amd64/jre',
-  }
-
   # get the war version from the passed in url, expecting something like
   # http://tarballs.openstack.org/ci/gerrit/gerrit-v2.10.2.22.acc615e.war
   $split1 = split($war, '/')

spec/acceptance/fixtures/default.pp

@@ -21,6 +21,7 @@ class { '::gerrit::mysql':
 }
 
 class { '::gerrit':
+  java_home                           => '/usr/lib/jvm/java-7-openjdk-amd64/jre',
   mysql_host                          => 'localhost',
   mysql_password                      => '12345',
   war                                 => 'http://tarballs.openstack.org/ci/test/gerrit-v2.11.4.13.cb9800e.war',

templates/gerrit.config.erb

@@ -48,7 +48,9 @@
 	includeDiff = <%= @sendemail_include_diff %>
 [container]
 	user = gerrit2
+<% if @java_home != "" -%>
 	javaHome = <%= @java_home %>
+<% end -%>
 <% if @container_javaoptions != "" -%>
         javaOptions = <%= @container_javaoptions %>
 <% end -%>