MXS-2020 Remove maxscale/debug.h

- Removed from all files.
- maxbase/assert.h included where necessary.

server/core/test/test_log.cc

@@ -19,9 +19,9 @@
 #include <stdlib.h>
 #include <string.h>
 #include <time.h>
+#include <maxbase/assert.h>
 #include <maxscale/alloc.h>
 #include <maxscale/log.h>
-#include <maxscale/debug.h>
 
 static void skygw_log_enable(int priority)
 {