Set a GEM_PATH in /etc/default/sensu

If we have gems installed in different locations, we'd like to be able
to use them without having to mess around the /opt/sensu directory.

manifests/init.pp

@@ -165,6 +165,10 @@
 #   String.  Ruby opts to be passed to the sensu services
 #   Default: ''
 #
+# [*gem_path*]
+#   String.  Paths to add to GEM_PATH if we need to look for different dirs.
+#   Default: ''
+#
 # [*log_level*]
 #   String.  Sensu log level to be used
 #   Default: 'info'
@@ -210,6 +214,7 @@
   $purge_config             = false,
   $use_embedded_ruby        = false,
   $rubyopt                  = '',
+  $gem_path                 = '',
   $log_level                = 'info',
 ){
 

templates/sensu.erb

@@ -1,4 +1,5 @@
 EMBEDDED_RUBY=<%= scope.lookupvar("sensu::use_embedded_ruby") %>
 LOG_LEVEL=<%= scope.lookupvar("sensu::log_level") %>
 RUBYOPT="<%= scope.lookupvar("sensu::rubyopt") %>"
+GEM_PATH="<%= scope.lookupvar("sensu::gem_path") %>"