updates peerImp to correctly cancel protocol start if shutdown was initiated

src/xrpld/overlay/detail/PeerImp.cpp

@@ -902,6 +902,9 @@ void
 PeerImp::doProtocolStart()
 {
     // a shutdown was initiated before the handshare, there is nothing to do
+    if (shutdown_)
+        return tryAsyncShutdown();
+
     onReadMessage(error_code(), 0);
 
     // Send all the validator lists that have been loaded

src/xrpld/overlay/detail/PeerImp.h

@@ -41,7 +41,6 @@
 #include <boost/thread/shared_mutex.hpp>
 
 #include <atomic>
-#include <chrono>
 #include <cstdint>
 #include <optional>
 #include <queue>