test: Be tolerant regarding exceptions on SSL issue

Depending on the environment, various exceptions can be risen, so be tolerant
regarding the exception type.

kedifa/test.py

@@ -36,6 +36,7 @@ import time
 import unittest
 import zc.lockfile
 import socket
+import OpenSSL.SSL
 
 from cryptography import x509
 from cryptography.hazmat.backends import default_backend
@@ -426,9 +427,16 @@ class KedifaIntegrationTest(KedifaMixinCaucase, unittest.TestCase):
     with open(incorrect_key_pem, 'w') as out:
       out.write(key_pem + certificate_pem)
 
-    with self.assertRaises(requests.exceptions.ConnectionError):
+    try:
       self.requests_get(
         self.kedifa_url + self.reference, cert=incorrect_key_pem)
+    except (
+      requests.exceptions.ConnectionError,
+      requests.exceptions.SSLError,
+      OpenSSL.SSL.SysCallError):
+      pass
+    except Exception:
+      raise
 
   def revokeCaucaseServiceCertifice(self):
     with captured_output() as (out, err):