ci: hook network-io tests into the pipeline
This runs the "pip install" tests once for Python 2 and 3 each.
Differential Revision: https://phab.mercurial-scm.org/D10075
test: update expected output in test-http.t
The output was introduced in
a4c19a162615 and is wrong and unstable. So we glob
it as other part of these tests already do.
Differential Revision: https://phab.mercurial-scm.org/D10153