Operators of comparison are not supported by queries for event's traits

[Igor Degtiarov]

EventFilter object has a dictionary "traits_filter" with optional parameter 'op': <eq, lt, le, ne, gt or ge>, but up to date using of this parameter is realized only in HBase and Mongodb, it is not supported by SQLAlchemy and finally it is not implemented in api.v2 at all (only 'op'='eq' is supported operator in API)

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/112582

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/112582
Committed: https://git.openstack.org/cgit/openstack/ceilometer/commit/?id=be88b00e9034b65229c1266ed5bf5ba084fb90f3
Submitter: Jenkins
Branch: master

commit be88b00e9034b65229c1266ed5bf5ba084fb90f3
Author: Igor Degtiarov <email address hidden>
Date: Wed Aug 27 17:12:25 2014 +0400

    Adding comparison operators in query for event traits

    In EventFilter we have an optional parameter 'op' in traits_filter part. But up
    to date usage of this param has been implemented only in Hbase and
    Mongodb backends. However in API we can use only 'op'='eq'.

    This change improves usage of parameter 'op' in query for events in api, and
    adds possibility to use comparison in query with SQL backend.

    Some tests are also added to cover using of this new feature.

    Closes-bug: #1354009
    Change-Id: I4824800eac7270bcfa10882a735e48d80bf32712