Link the distro directory to the directory containing all supported
distros. Add the x86_64 arch contraint required by the isa plugin to an
isolated file that is combined with all jobs.
Signed-off-by: Loic Dachary <loic@dachary.org>
Add the distros directory which enumerates the os_type and
os_version on which the suite is to run.
http://tracker.ceph.com/issues/9660Fixes: #9660
Signed-off-by: Loic Dachary <loic-201408@dachary.org>