"action_type" type not validated by REST API

[Ivar Lazzaro]

When creating a policy action, the "action_type" field is not validated to be a string by the REST API.
This causes issues when a different type (eg. boolean) is posted in place of a string:

2015-06-06 02:11:53.550 ERROR neutron.api.v2.resource [req-26e4b488-67d1-4a04-832c-f79756c9fb17 demo demo] create failed
2015-06-06 02:11:53.550 23045 ERROR neutron.api.v2.resource Traceback (most recent call last):
2015-06-06 02:11:53.550 23045 ERROR neutron.api.v2.resource File "/opt/stack/new/neutron/neutron/api/v2/resource.py", line 83, in resource
2015-06-06 02:11:53.550 23045 ERROR neutron.api.v2.resource result = method(request=request, **args)
2015-06-06 02:11:53.550 23045 ERROR neutron.api.v2.resource File "/opt/stack/new/neutron/neutron/api/v2/base.py", line 392, in create
2015-06-06 02:11:53.550 23045 ERROR neutron.api.v2.resource allow_bulk=self._allow_bulk)
2015-06-06 02:11:53.550 23045 ERROR neutron.api.v2.resource File "/opt/stack/new/neutron/neutron/api/v2/base.py", line 650, in prepare_request_body
2015-06-06 02:11:53.550 23045 ERROR neutron.api.v2.resource res_dict[attr] = attr_vals['convert_to'](res_dict[attr])
2015-06-06 02:11:53.550 23045 ERROR neutron.api.v2.resource File "/opt/stack/new/group-based-policy/gbpservice/neutron/extensions/group_policy.py", line 224, in convert_action_to_case_insensitive
2015-06-06 02:11:53.550 23045 ERROR neutron.api.v2.resource return value.lower()
2015-06-06 02:11:53.550 23045 ERROR neutron.api.v2.resource AttributeError: 'bool' object has no attribute 'lower'

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/273307

[OpenStack Infra (hudson-openstack)]

Change abandoned by Sumit Naiksatam (<email address hidden>) on branch: master
Review: https://review.openstack.org/273307
Reason: Old patch, probably not needed, can be revived if needed.