python3Packages.clustershell: remove blocking test

remove tests/TreeGatewayTest.py because it does not return.

apparently

    def wait(self):
        """wait for task/thread termination"""
        # can be blocked indefinitely if StreamWorker doesn't complete
        self.task.join()

does apply in nix sandbox

fixes #315146

pkgs/development/python-modules/clustershell/default.nix

@@ -69,10 +69,9 @@ buildPythonPackage rec {
     rm tests/TaskDistantPdshMixin.py
     rm tests/TaskDistantPdshTest.py
     rm tests/TaskRLimitsTest.py
+    rm tests/TreeGatewayTest.py
 
     nosetests -v \
-      -e test_channel_ctl_shell_remote1 \
-      -e test_channel_ctl_shell_remote2 \
       -e test_fromall_grouplist \
       -e test_rank_placeholder \
       -e test_engine_on_the_fly_launch \
@@ -92,9 +91,6 @@ buildPythonPackage rec {
       -e testClushConfigSetRlimit  \
       -e testTimerInvalidateInHandler \
       -e testTimerSetNextFireInHandler \
-      -e test_channel_ctl_shell_mlocal1 \
-      -e test_channel_ctl_shell_mlocal2 \
-      -e test_channel_ctl_shell_mlocal3 \
       -e test_node_placeholder \
     tests/*.py
   '';