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/utils.c

@@ -33,7 +33,14 @@ ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
 
 #include <ctype.h>
 #include <sys/stat.h>
-#include <sys/stat.h>
+
+#include <sys/syscall.h>
+#include <unistd.h>
+#if defined(__APPLE__)
+#include <mach/mach.h>
+#elif defined(HAVE_SYS_THR_H)
+#include <sys/thr.h>
+#endif
 
 #ifdef HAVE_DEV_URANDOM
 #include <fcntl.h>