tests: skip a detailed exit status in test-lfs-test-server
The mode of failure here differs between `lfs-test-server` and `hg serve`, and
they each throw a different exception. The `hg serve` case raises a subclass of
`StorageError`, which gets a detailed status. The `lfs-test-server` case raises
a subclass of `Abort`, which does not. Since the exit code isn't currently
conditionizable in the tests, this is the simplest way to avoid the failure.
Differential Revision: https://phab.mercurial-scm.org/D9836
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