trivial: Clean up a DeprecationWarning
trivial: Clean up a DeprecationWarning

Looks like

    DeprecationWarning: an integer is required (got type Timestamp).
    Implicit conversion to integers using __int__ is deprecated, and
    may be removed in a future version of Python.

Change-Id: I320b7711f009cb0cffab38c105002ddbae1fa9e5

tipabu/swift,tipabu/swift,openstack/swift,openstack/swift,tipabu/swift,openstack/swift,openstack/swift,tipabu/swift