Allow setting a hash of arbitrary postgresql settings

Prior to this commit, you could only manage the settings that were
provided as parameters.

After this commit, you can pass an arbitrary hash of other
postgresql settings you'd like to manage and they will be managed
as well.

Author: npwalker

manifests/postgresql_settings.pp

@@ -7,6 +7,7 @@
   String     $maintenance_work_mem                     = "${::memory['system']['total_bytes'] / 1024 / 1024 / 16}MB",
   String     $work_mem                                 = '8MB',
   Integer    $max_connections                          = 1000,
+  Hash       $arbitrary_postgresql_conf_settings       = {},
   Float[0,1] $checkpoint_completion_target             = 0.9,
   Float[0,1] $checkpoint_segments                      = 128,
   Boolean    $manage_postgresql_service                = true,
@@ -83,6 +84,14 @@
     value => "${checkpoint_segments}",
   }
 
+  if !empty($arbitrary_postgresql_conf_settings) {
+    $arbitrary_postgresql_conf_settings.each | $key, $value | {
+      postgresql_conf { $key :
+        value => "${value}",
+      }
+    }
+  }
+
   if $manage_fact_values_autovacuum_cost_delay {
     postgresql_psql { 'Set autovacuum_cost_delay=0 for fact_values' :
       command    => 'ALTER TABLE fact_values SET ( autovacuum_vacuum_cost_delay = 0 )',