Bug 186594: $db_sock was not being exported from Bugzilla/Config.pm

patch by sergeyli@pisem.net (Sergey Lipnevich)
r=bbaetz, a=justdave

webtools/bugzilla/Bugzilla/Config.pm

@@ -46,7 +46,7 @@ use Bugzilla::Util;
 %Bugzilla::Config::EXPORT_TAGS =
   (
    admin => [qw(GetParamList UpdateParams SetParam WriteParams)],
-   db => [qw($db_host $db_port $db_name $db_user $db_pass)],
+   db => [qw($db_host $db_port $db_name $db_user $db_pass $db_sock)],
   );
 Exporter::export_ok_tags('admin', 'db');