Skip upgrading to setuptools 36.2.1

During uninstall 36.2.0, the following exception raised for
setuptools:

Change-Id: I77fbac0da45480fce85ee8e9db1fc097a9fa5db9
AttributeError: Distribution instance has no attribute 'install_requires'
Reviewed-on: https://review.gerrithub.io/370856
Reviewed-by: Dennis Dmitriev <dis.xcom@gmail.com>
Tested-by: Dennis Dmitriev <dis.xcom@gmail.com>
diff --git a/tcp_tests/requirements.txt b/tcp_tests/requirements.txt
index a5e7619..7a4fbbf 100644
--- a/tcp_tests/requirements.txt
+++ b/tcp_tests/requirements.txt
@@ -15,3 +15,4 @@
 functools32
 python-k8sclient==0.4.0
 salt-pepper
+setuptools!=36.2.1