Add CLI to show instance usage audit log

Registered by int32bit

Currently we can get instance usage audit logs via Nova API[1], and the docs also update for it[2]. It is necessary to add that to our client and CLI.

[1] https://github.com/openstack/nova/blob/master/nova/api/openstack/compute/instance_usage_audit_log.py
[2] http://developer.openstack.org/api-ref/compute/#server-usage-audit-log-os-instance-usage-audit-log

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int32bit
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int32bit
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