Extend tests of error cases

- test raising SIGINT in every state
 - test going to Error state from every state
 - add new states (bind/connect) to exception tests

fairmq/StateMachine.h

@@ -94,6 +94,8 @@ class StateMachine
     static State GetState(const std::string& state);
     static Transition GetTransition(const std::string& transition);
 
+    struct ErrorStateException : std::runtime_error { using std::runtime_error::runtime_error; };
+
   private:
     std::shared_ptr<void> fFsm;
 };