py3: account for demand import difference between Python versions
Our lazy importer for Python 3 will validate that modules are
loadable before returning a stub module object. This is different
from Python 2, which will always return a stub module object.
While we could change behavior of the Python 3 demand importer,
that seems like a problem for another day.
This commit teaches test-extension.t about that difference in
behavior.
Differential Revision: https://phab.mercurial-scm.org/D5798
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