Add issued handlers to auth_ref and fixtures

issued_at is a standard part of V2 and V3 tokens so add it to
AccessInfo in a similar way to expiry. Also it should be included when
generating tokens so include it in fixtures.

Change-Id: I0d62d8ce6472466886751e10e98046b8e398e079
Updated from global requirements

Change-Id: Ibb290d0f2d616b7730914bfc829a7f555ba0b688
Merge "Add issued handlers to auth_ref and fixtures"
Test commit