Changes the way keyrotation is enabled by default

Key rotation was enabled by default by setting the global encryption method to IAX_ENCRYPT_KEYROTATE.  the problem with this is that if encryption is not enabled, and the encryption method is set to anything except 0, the peer appears to have encryption enabled when issuing a "iax2 show peers".  Rather than have the key rotation bit always set by default, it is now only set when an encryption method is enabled. 

(closes issue #14523)
Reported by: mvanbaak


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@178030 65c4cc65-6c06-0410-ace0-fbb531ad65f3

channels/chan_iax2.c

@@ -1310,9 +1310,9 @@ static int get_encrypt_methods(const char *s)
 {
 	int e;
 	if (!strcasecmp(s, "aes128"))
-		e = IAX_ENCRYPT_AES128;
+		e = IAX_ENCRYPT_AES128 | IAX_ENCRYPT_KEYROTATE;
 	else if (ast_true(s))
-		e = IAX_ENCRYPT_AES128;
+		e = IAX_ENCRYPT_AES128 | IAX_ENCRYPT_KEYROTATE;
 	else
 		e = 0;
 	return e;
@@ -11257,8 +11257,6 @@ static int set_config(char *config_file, int reload)
 	memset(&globalflags, 0, sizeof(globalflags));
 	ast_set_flag(&globalflags, IAX_RTUPDATE);
 	
-	/* Turns on support for key rotation during encryption. */
-	iax2_encryption |= IAX_ENCRYPT_KEYROTATE;
 #ifdef SO_NO_CHECK
 	nochecksums = 0;
 #endif