Stopped spamming of debug messages during attended transfer.

While autoservice is running and servicing a channel the callid is being stored
and removed in the thread's local storage for each iteration of the thread loop.
If debug was set to a sufficient level the log file would be spammed with callid
thread local storage debug messages.

Added a new function that checks to see if the callid to be stored is different
than what is already contained (if anything).  If it is different then
store/replace and log, otherwise just leave as is.  Also made it so all logging
of debug messages pertaining to the callid thread storage outputs only when
TEST_FRAMEWORK is defined.

(issue ASTERISK-21014)
(closes issue ASTERISK-21014)
Report by: Rusty Newton
Review: https://reviewboard.asterisk.org/r/2324/


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@381557 65c4cc65-6c06-0410-ace0-fbb531ad65f3

include/asterisk/logger.h

@@ -280,6 +280,15 @@ struct ast_callid *ast_read_threadstorage_callid(void);
  */
 #define ast_callid_unref(c) ({ ao2_ref(c, -1); (NULL); })
 
+/*!
+ * \brief Sets what is stored in the thread storage to the given
+ *        callid if it does not match what is already there.
+ *
+ * \retval 0 - success
+ * \retval non-zero - failure
+ */
+int ast_callid_threadassoc_change(struct ast_callid *callid);
+
 /*!
  * \brief Adds a known callid to thread storage of the calling thread
  *