Fix pecan policy enforcement for GET requests
Fix pecan policy enforcement for GET requests

The policy enforcement hook had no effect on responses.
This patch corrected that. The fix was validated with the
standard API tests.

Change-Id: I014a18474ff79d48de469d7fc2a12c2e195ce22d

yanheven/neutron,bigswitch/neutron,SamYaple/neutron,SamYaple/neutron,mahak/neutron,jumpojoy/neutron,glove747/liberty-neutron,MaximNevrov/neutron,noironetworks/neutron,asgard-lab/neutron,dhanunjaya/neutron,openstack/neutron,JianyuWang/neutron,apporc/neutron,chitr/neutron,jumpojoy/neutron,wolverineav/neutron,klmitch/neutron,swdream/neutron,eayunstack/neutron,swdream/neutron,yanheven/neutron,eayunstack/neutron,dims/neutron,openstack/neutron,dhanunjaya/neutron,dims/neutron,openstack/neutron,cloudbase/neutron,MaximNevrov/neutron,noironetworks/neutron,sebrandon1/neutron,wolverineav/neutron,huntxu/neutron,glove747/liberty-neutron,JianyuWang/neutron,mahak/neutron,cloudbase/neutron,sebrandon1/neutron,igor-toga/local-snat,igor-toga/local-snat,apporc/neutron,bigswitch/neutron,huntxu/neutron,klmitch/neutron,chitr/neutron,mahak/neutron,asgard-lab/neutron