Prepare MinBwAllocationPlacementTest for new neutron API ext

The port-resource-request-groups neutron API extension proposed in
I99a49b107b1872ddf83d1d8497a26a8d728feb07 changes the format of the
port.binding:profile.allocation value. The existing tests are depending
on the format so they are adapted now to accept both format.

blueprint: qos-minimum-guaranteed-packet-rate
Change-Id: I7c5ecfe1015dba4ad0b70bbdcacc079503c50e65
1 file changed