Update router routes with XML request fails

[Bob Melander]

As snippet below illustrates, updates of a neutron router's routes fail for XML formatted requests.

(quantum) router-update r2 --routes type=dict list=true destination=192.168.2.0/16,nexthop=10.0.22.15
Updated router: r2
(quantum) router-update r2 --request-format xml --routes type=dict list=true destination=192.168.1.0/16,nexthop=10.0.22.15
Invalid input for routes. Reason: Invalid data format for hostroute: '{'route': {'destination': '192.168.1.0/16', 'nexthop': '10.0.22.15'}}'.
(quantum)

The problem is in the XML deserialization.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/35821