Translate b"000001010000Z" locked time values to 2001-01-15T00:00Z. This
is the approximate epoch of enwiki's creation.

A pwdAccountLockedTime of b"000001010000Z" is the marker that indicates
cleanup of a tool should happen immediately. In normal operation this
value should be in the LDAP directory so briefly that it would be
unlikely to be found in a search. If however the tools deletion process
is stuck for some reason (like $HOME migrating to a new NFS service that
is not exposed to all of the deletion agents) then we may so them.