gloo_test test_close_connection not working as intended due to unwanted comma

[code-review-doctor]

🐛 Describe the bug

There is an unwanted comma on this line

pytorch/caffe2/contrib/gloo/gloo_test.py

Line 602 in 1b66915

closer = comm_rank == comm_size // 2,

This makes closer always evaluate to a tuple containing one item: either (True,) or (False,). Notice therefore that closer will always evaluate to truthy because a non-empty tuple is always truthy.

This is a problem because the following code will never be hit because closer is never falsey:

pytorch/caffe2/contrib/gloo/gloo_test.py

Lines 609 to 613 in 1b66915

	if not closer:
	net.Barrier(
	[common_world],
	[],
	engine=op_engine)

so it looks like only closing path is covered in this test.

The solution is to remove the unwanted comma. I can make a PR for this?

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