Enable soft_write_failure setting when $puppetdb::disablessl = true

The puppet agent will refuse to run if it can’t make a secure
connection to the puppetdb server.  This setting disables that in case
SSL is disabled.

manifests/master/puppetdb_conf.pp

@@ -3,7 +3,7 @@
 class puppetdb::master::puppetdb_conf (
   $server             = 'localhost',
   $port               = '8081',
-  $soft_write_failure = false,
+  $soft_write_failure = $puppetdb::disable_ssl ? { true => true, default => false, },
   $puppet_confdir     = $puppetdb::params::puppet_confdir,
 ) inherits puppetdb::params {