core: set q_malloc as default memory manager

- useful to catch easier memory issues in development phase

main.c

@@ -503,7 +503,7 @@ char* pgid_file = 0;
 
 
 /* memory manager */
-#define SR_MEMMNG_DEFAULT	"fm"
+#define SR_MEMMNG_DEFAULT	"qm"
 
 char *sr_memmng_pkg = NULL;
 char *sr_memmng_shm = NULL;