add exception check for paramiko if older then 1.7

lib/ansible/connection.py

@@ -69,6 +69,9 @@ class ParamikoConnection(object):
  	        port=self.runner.remote_port
             )
         except Exception, e:
+            if str(e).find("PID check failed") != -1:
+                raise errors.AnsibleError("paramiko version issue, please upgrade paramiko on the overlord")
+            else: 
                 raise errors.AnsibleConnectionFailed(str(e))
         return self