Summary:
We do not want to switch people to obsshelve and then find out that their
traditional shelves cannot be unshelved.
Test Plan: - check that added test passes
Reviewers: #sourcecontrol
Differential Revision: https://phabricator.intern.facebook.com/D5180998
Summary: Just for an early detection of bad config being distributed.
Test Plan: - add a test case
Reviewers: #sourcecontrol
Differential Revision: https://phabricator.intern.facebook.com/D5180986
Summary:
See bottom commit of the stack for the motivation.
This commit copies obsshelve-related tests from hotfixed core and cleans them
up a little bit.
Test Plan: - run just added test
Reviewers: #sourcecontrol
Differential Revision: https://phabricator.intern.facebook.com/D5180981
