module load priority

This patch adds the option to give a module a load priority. The value represents the order in which a module's load() function is initialized.  The lower the value, the higher the priority.  The value is only checked if the AST_MODFLAG_LOAD_ORDER flag is set.  If the AST_MODFLAG_LOAD_ORDER flag is not set, the value will never be read and the module will be given the lowest possible priority
on load.  Since some modules are reliant on a timing interface, the timing modules have been given a high load priorty.

(closes issue #15191)
Reported by: alecdavis
Tested by: dvossel

Review: https://reviewboard.asterisk.org/r/262/


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@199743 65c4cc65-6c06-0410-ace0-fbb531ad65f3

res/res_timing_pthread.c

@@ -521,5 +521,8 @@ static int unload_module(void)
 
 	return res;
 }
-
-AST_MODULE_INFO_STANDARD(ASTERISK_GPL_KEY, "pthread Timing Interface");
+AST_MODULE_INFO(ASTERISK_GPL_KEY, AST_MODFLAG_LOAD_ORDER, "pthread Timing Interface",
+		.load = load_module,
+		.unload = unload_module,
+		.load_pri = 10,
+		);