py3: Remove comparison >=2 of debnug log level

We have only one debug log level and it causes issues with py3.
...
  File "/usr/lib/python3.5/site-packages/ipaserver/rpcserver.py", line 490, in marshal
    response, version, pretty_print=self.api.env.debug >= 2
TypeError: unorderable types: str() >= int()

https://pagure.io/freeipa/issue/4985

Reviewed-By: Stanislav Laznicka <slaznick@redhat.com>

ipatests/test_ipapython/test_session_storage.py

@@ -22,7 +22,7 @@ class test_session_storage(object):
         # os.environ['KRB5CCNAME'] = 'FILE:%s/ccache' % tmpdir
         self.principal = 'admin'
         self.key = 'X-IPA-test-session-storage'
-        self.data = 'Test Data'
+        self.data = b'Test Data'
 
     def test_01(self):
         session_storage.store_data(self.principal, self.key, self.data)