Update rabbitmq-components.mk

Author: dumbbell

rabbitmq-components.mk

@@ -213,7 +213,7 @@ export current_rmq_ref
 
 ifeq ($(origin base_rmq_ref),undefined)
 ifneq ($(wildcard .git),)
-possible_base_rmq_ref := master
+possible_base_rmq_ref := v3.8.x
 ifeq ($(possible_base_rmq_ref),$(current_rmq_ref))
 base_rmq_ref := $(current_rmq_ref)
 else