inconnect bug fix

Add missing inconnect = false.
This bug leads to only one disconnection allow.

Needed for #106

Author: Konstantin Belyavskiy

Diff for: tarantool/connection.py

@@ -335,6 +335,7 @@ def check():  # Check that connection is alive
         try:
             self.inconnect = True
             self.handshake()
+            self.inconnect = False
         except:
             self.inconnect = False
             raise