Update tenacity for CS8 in Yoga
Update tenacity for CS8 in Yoga

We built 6.3.1 for cs8 some time ago but didn't promote it. This patch
is proposing to bump it in cs8 as it is already in cs9 and it's minimal
version required for ceilometer, i.e.

Change-Id: I65bc47bc4059a4797c9882c21221940f3eb2c38c

redhat-openstack/rdoinfo