Make test test_remove_associated_ports to be compatible with L3HA

Negative API test
neutron_tempest_plugin.api.test_routers_negative.RoutersNegativePolicyTest.\
test_remove_associated_ports

was trying to remove all ports which belongs to the specic device
(router) and expected Conflict response for each of them.
In L3HA environment that's not true and router ha interfaces can be
removed without any problems. That caused failure of the test when L3_ha
was enabled.
This patch fixes it by trying to delete different types of port than ha
interfaces.

Change-Id: Iea2655a4dae2c8e260fb1dff9fdd9f426fe3c1b3
1 file changed