Cleaning up literal dict in validators.py
Cleaning up literal dict in validators.py

Change-Id: I89ddc9e3effd294ab55676c62b8edbe3e282ad4c

openstack/barbican,MCDong/barbican,jmvrbanac/barbican,cloudkeep/barbican,MCDong/barbican,jmvrbanac/barbican,cloudkeep/barbican,cneill/barbican,openstack/barbican,cneill/barbican