Fix v3 with UUID and memcache expiring.

- Regenerate tokens to change expires in expires_at.

Change-Id: Iaa62dca50d34a228e4850b59d263b807c5ee3549
Check Expiry

Explicitly checks the expiry on the tokens, and rejects tokens that
have expired

had to regenerate the sample data for the tokens as they all had been
generated with values that are now expired.

bug 1179615

Change-Id: Ie06500d446f55fd0ad67ea540c92d8cfc57483f4

Conflicts:
	tests/test_auth_token_middleware.py