Sadly there is no reasonable way how to extract information about
supported query parameters ouf ot Octavia code. Moreover there is even
no documentation about that except of basic statement "The Octavia API
v2 supports filtering based on all top level attributes of a resource"
which is only partially true. So for now hardcode those parameter
schemas as known by OpenStackSDK (with exception of definitely wrong
ones).
Change-Id: I3684a6e7d31c8ac8842049373291b234574590aa
cadf4f8652