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This allow to get a deep view of the reference api by passing the
`deep` GET parameters to the request.
It is also possible to request a single site or the specific list of nodes
assigned to an OAR job id.

root_controller_spec.rb and sites_controller_spec.rb implemented two
conflicting requirements when deciding how to present the root of the
API depending on whether the root was fictionnal through API_MOUNT_PATH or the
real root of the service.

This commit chooses to allways present a trailing / when building hrefs

The related test in root_controller_spec has also been updated to
reflect that the tested behavior (prepending sid) is acheived by using
X-Api-Version header rather that X-Api-Path-Prefix on real deployments.

MARGERY David authored Jun 12, 2017 and Florent Didier committed Jun 21, 2017

This is to reduce diff to lnussbaum/jessie-rebased
(e698119d6dd76ba5b9c30336c69f58bc85e3ec8a) as much a possible
to understand more precisely the differences between the v3 branch and
the development branch

BASU Anirvan authored Oct 26, 2016 and Florent Didier committed Jun 21, 2017

This only applies to sites containing servers (e.g. nancy in test repository)

Second commit for bug #6363 with a large part of unit tests successful + updated reference-repository

Correct fake git repository related tests, and jobs related tests now that the test database for jobs has 5 more jobs