Restoring location of r.Close() in retry mechanism since the move created a deadlock. (#122)

Moving the r.Close() call in the retry mechanism created a deadlock since r.Close() also uses the client lock to avoid multiple routines closing at the same time.

This commit reverts that change.

realis.go

@@ -504,11 +504,14 @@ func (r *realisClient) ReestablishConn() error {
 	// Close existing connection
 	r.logger.Println("Re-establishing Connection to Aurora")
 
+	// This call must happen before we lock as it also uses
+	// the same lock from the client since close can be called
+	// by anyone from anywhere.
+	r.Close()
+
 	r.lock.Lock()
 	defer r.lock.Unlock()
 
-	r.Close()
-
 	// Recreate connection from scratch using original options
 	newRealis, err := NewRealisClient(r.config.options...)
 	if err != nil {