Provide T headers via log.h

It seems that many compilation units include T.h through the config
module (as evidenced when taking out T.h from
config_load_configmodule.h). This is strange, because T.h is only used
in the logging headers. Hence, move it to there, where it is used.

common/utils/LOG/log.h

@@ -52,6 +52,7 @@
 #endif
 #include <pthread.h>
 #include <common/utils/utils.h>
+#include "common/utils/T/T.h"
 #if ENABLE_LTTNG
 #include "lttng-log.h"
 #endif