bmqp::Protocol: Enum class for eStopRequestVersion (#662)

Signed-off-by: Yuan Jing Vincent Yan <[email protected]>

Author: kaikulimu

src/groups/bmq/bmqp/bmqp_protocol.h

@@ -338,7 +338,9 @@ bool operator==(const SubQueueInfo& lhs, const SubQueueInfo& rhs);
 struct Protocol {
     // TYPES
 
-    enum eStopRequestVersion { e_V1 = 1, e_V2 = 2 };
+    struct eStopRequestVersion {
+        enum Enum { e_V1 = 1, e_V2 = 2 };
+    };
 
     /// A constant used to declare the length of static part of the array of
     /// subQueueIds (or AppKeys).