Shade used 'attached' as a filter for listing floating IPs,
but this is not a supported parameter in neutron. In before, the test
passed because neutron server ignored this parameter and returned
all the floating IPs. However, neutron is planing to employ a strict
validation on the list endpoint [1]. As a result, neutron will reject
the request with 400 response if the request contains unknown filter.
This patch fixes the usage of neutron API. It passes filters to neutron
API only if they are known supported filters. The list of supported
filters for listing floating IPs can be found in the neutron API
reference [2].
[1] https://review.openstack.org/#/c/574907/
[2] https://developer.openstack.org/api-ref/network/v2/#id130
Change-Id: I124adfc5e9cdd5bc20aacf23f9dcc10c55b0870b
51e2989fd0