[DistDGL] Fixing bug in test_dist_objects

[drivanov]

Description

The test tests/dist/test_dist_objects.py::test_dist_objects fails with following error message:

  File "/opt/dgl/dgl-source/tests/dist/python/run_dist_objects.py", line 50, in run_server
    g = dgl.distributed.DistGraphServer(
TypeError: DistGraphServer.__init__() got an unexpected keyword argument 'keep_alive'

It happens because keep_alive parameter was eliminated by

commit 0d9b6bfd5a1ac04ec9727c14fc662b4942700b24
Author: Rhett Ying <85214957+Rhett-Ying@users.noreply.github.com>
Date:   Mon Jul 3 09:26:27 2023 +0800

    [TensorpipeDeprecation] remove long live server support from DistDGL (#5931)

Today the parameters of DistGraphServer.__init__() are

    def __init__(
        self,
        server_id,
        ip_config,
        num_servers,
        num_clients,
        part_config,
        disable_shared_mem=False,
        graph_format=("csc", "coo"),
        use_graphbolt=False,
    ):

Checklist

Please feel free to remove inapplicable items for your PR.

• I've leverage the tools to beautify the python and c++ code.
• The PR is complete and small, read the Google eng practice (CL equals to PR) to understand more about small PR. In DGL, we consider PRs with less than 200 lines of core code change are small (example, test and documentation could be exempted).
• To the best of my knowledge, examples are either not affected by this change, or have been fixed to be compatible with this change

Changes

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