vault: test_server: Fix exception structure
swh.core [2] changed the remote exception serialization handling.
So the current build [1] is broken. It needs adaptation to retrieve the exception information at its first level. This adapts accordingly the failing tests.
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[1] https://jenkins.softwareheritage.org/job/DVAU/job/tests/881/
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[2] Related to swh-core!187 (closed) (released in swh.core 0.9.0)
Test Plan
tox
Migrated from D4553 (view on Phabricator)