remove redundant headers

Author: a114j0y

orchagent/retrycache.h

@@ -1,13 +1,7 @@
-#ifndef SWSS_RETRY_CACHE_H
-#define SWSS_RETRY_CACHE_H
+#pragma once
 
 #include <unordered_set>
 #include <unordered_map>
-#include <sys/time.h>
-#include <fstream>
-#include <sstream>
-#include <map>
-#include "timestamp.h"
 #include "recorder.h"
 #include "rediscommand.h"
 
@@ -23,7 +17,6 @@ enum ConstraintType
     RETRY_CST_ECMP          // ecmp resources exhausted
 };
 
-
 static inline std::ostream& operator<<(std::ostream& os, ConstraintType t) {
     switch(t) {
         case ConstraintType::RETRY_CST_DUMMY:   return os << "RETRY_CST_DUMMY";
@@ -210,4 +203,3 @@ class RetryCache
 
 typedef std::unordered_map<std::string, std::shared_ptr<RetryCache>> RetryCacheMap;
 
-#endif /* SWSS_RETRY_CACHE_H */