Reduce the execution time of brpc_circuit_unittest

test/brpc_circuit_breaker_unittest.cpp

@@ -23,7 +23,7 @@ const int kLongWindowSize = 1000;
 const int kShortWindowErrorPercent = 10;
 const int kLongWindowErrorPercent = 5;
 const int kMinIsolationDurationMs = 100;
-const int kMaxIsolationDurationMs = 30000;
+const int kMaxIsolationDurationMs = 1000;
 const int kErrorCodeForFailed = 131;
 const int kErrorCodeForSucc = 0;
 const int kErrorCost = 1000;