Remove tools/setup_helpers/dist_check.py #25879
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What dist_check.py does is largely merely determining whether we should
use set "USE_IBVERBS" to ON or OFF when the user sets "USE_GLOO_IBVERBS"
to ON. But this is unnecessary, because this complicated determination
will always be overrided by gloo:
https://github.com/facebookincubator/gloo/blob/2101e02ceabd9f1b0bb354f6ea705cefe83558b2/cmake/Dependencies.cmake#L19-L28
Since dist_check.py becomes irrelevant, this commit also simplifies the
setting of
USE_DISTRIBUTED
(by removing its explicit setting in Python scripts), and deprecateUSE_GLOO_IBVERBS
in favorof
USE_IBVERBS
.