Updated openstack/openstack
Project: openstack/ceilometer  5a0f0433770b94dfeca925c01480784e91af1f9a

Fixes aggregator transformer timestamp and user input handling

Sample timestamps should be parsed with parse_isotime(), not
parse_strtime().

User input should be validated and fail with ValueError if wrong.

Closes-bug: #1342664
Change-Id: Ied429053eecfa355c1e73caae705e5b187c8b3aa