Don't log when insecure connection fails

Summary:
Context: https://fb.workplace.com/groups/flippersupport/permalink/803808233433170/

A similar change was done earlier with the secure connection route.
This does the same for the insecure route.

Reviewed By: mweststrate

Differential Revision: D21227196

fbshipit-source-id: 844cb674b5b16033977f451bbc3d8bbc69732273

xplat/Flipper/FlipperConnectionManagerImpl.h

@@ -68,7 +68,7 @@ class FlipperConnectionManagerImpl : public FlipperConnectionManager {
   std::shared_ptr<ConnectionContextStore> contextStore_;
 
   void startSync();
-  void doCertificateExchange();
+  bool doCertificateExchange();
   bool connectSecurely();
   bool isCertificateExchangeNeeded();
   void requestSignedCertFromFlipper();