fix lower constraints
fix lower constraints

Update the lower constraints so they match the expected values.

Change-Id: Ifd267ba48087ec028e08a23b48b23a8314a241fa
Signed-off-by: Doug Hellmann <0798ebecfb7bc4dfb9d0445c2fa030eb64e1fa1c@doughellmann.com>

openstack/barbican,openstack/barbican