Fix for issue 239 (#546)

* Fix for issue 239

* Add unittest

Author: magianxd

pyVmomi/SoapAdapter.py

@@ -1642,6 +1642,8 @@ def InvokeAccessor(self, mo, info):
             if isinstance(e, self.SESSION_EXCEPTIONS):
                # Our session might've timed out, change our state and retry.
                self._SetStateUnauthenticated()
+               retriesLeft -= 1
+               continue
             else:
                raise e
          return obj

tests/test_vim_session_oriented_stub.py

@@ -0,0 +1,13 @@
+import tests
+
+from pyVim import connect
+
+
+class SoapAdapterTests(tests.VCRTestBase):
+    def test_invoke_method_login_session_exception(self):
+        def login_fail(*args, **kwargs):
+            raise vim_session.SESSION_EXCEPTIONS[0]()
+
+        stub = connect.SoapStubAdapter()
+        vim_session = connect.VimSessionOrientedStub(stub, login_fail)
+        self.assertRaises(SystemError, vim_session.InvokeAccessor, "mo", "info")