Filter out floating IPs from server IPs list

In test
tempest.api.compute.servers.test_attach_interfaces.AttachInterfacesUnderV243Test.
test_add_remove_fixed_ip
functions _wait_for_ip_increase() and _wait_for_ip_decreace() will
now filter out floating IPs from the list of server IP addresses
to compare only number of fixed IPs as this test is only about adding
and removing fixed IPs to the server.

Change-Id: I38c17da4ff492569cf572718c4443ebcc4718f62
Closes-Bug: #1834758
1 file changed