main/astobj2: Make REF_DEBUG a menuselect item; improve REF_DEBUG output

This patch does the following:
(1) It makes REF_DEBUG a meneselect item. Enabling REF_DEBUG now enables
    REF_DEBUG globally throughout Asterisk.
(2) The ref debug log file is now created in the AST_LOG_DIR directory.
    Every run will now blow away the previous run (as large ref files
    sometimes caused issues). We now also no longer open/close the file
    on each write, instead relying on fflush to make sure data gets written
    to the file (in case the ao2 call being performed is about to cause a
    crash)
(3) It goes with a comma delineated format for the ref debug file. This
    makes parsing much easier. This also now includes the thread ID of the
    thread that caused ref change.
(4) A new python script instead for refcounting has been added in the
    contrib/scripts folder.

Review: https://reviewboard.asterisk.org/r/3377/
........

Merged revisions 412114 from http://svn.asterisk.org/svn/asterisk/branches/1.8


git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/11@412115 65c4cc65-6c06-0410-ace0-fbb531ad65f3

main/asterisk.c

@@ -4128,6 +4128,8 @@ int main(int argc, char *argv[])
 	register_config_cli();
 	read_config_maps();
 
+	astobj2_init();
+
 	if (ast_opt_console) {
 		if (el_hist == NULL || el == NULL)
 			ast_el_initialize();
@@ -4208,8 +4210,6 @@ int main(int argc, char *argv[])
 
 	threadstorage_init();
 
-	astobj2_init();
-
 	ast_format_attr_init();
 	ast_format_list_init();
 	ast_rtp_engine_init();