Add log statements for policy check failures
Add log statements for policy check failures

Misconfiguration of the policy.json file may
cause policy check failures. It's kind to the
developer to log the underlying exception
so that he/she can have more information as to
how to address the problem.

Closes bug: #1246139

Change-Id: I8664959cb98b3a41d159db3acb91da9baba810ae

jerryz1982/neutron,noironetworks/neutron,alexandrucoman/vbox-neutron-agent,miyakz1192/neutron,ntt-sic/neutron,CiscoSystems/neutron,rdo-management/neutron,MaximNevrov/neutron,JianyuWang/neutron,igor-toga/local-snat,sasukeh/neutron,zhhf/charging,sasukeh/neutron,cloudbase/neutron,vbannai/neutron,vbannai/neutron,redhat-openstack/neutron,dims/neutron,openstack/neutron,openstack/neutron,redhat-openstack/neutron,bgxavier/neutron,bigswitch/neutron,aristanetworks/neutron,adelina-t/neutron,javaos74/neutron,mmnelemane/neutron,NeCTAR-RC/neutron,cloudbase/neutron-virtualbox,vijayendrabvs/ssl-neutron,JioCloud/neutron,chitr/neutron,CiscoSystems/neutron,klmitch/neutron,CiscoSystems/vespa,swdream/neutron,paninetworks/neutron,skyddv/neutron,oeeagle/quantum,yamahata/tacker,shahbazn/neutron,jerryz1982/neutron,openstack/neutron,mahak/neutron,beagles/neutron_hacking,CiscoSystems/neutron,pnavarro/neutron,leeseulstack/openstack,bgxavier/neutron,sebrandon1/neutron,antonioUnina/neutron,magic0704/neutron,vijayendrabvs/hap,vveerava/Openstack,dhanunjaya/neutron,leeseuljeong/leeseulstack_neutron,adelina-t/neutron,oeeagle/quantum,barnsnake351/neutron,sajuptpm/neutron-ipam,sajuptpm/neutron-ipam,vijayendrabvs/hap,asgard-lab/neutron,infobloxopen/neutron,aristanetworks/neutron,cisco-openstack/neutron,mandeepdhami/neutron,JianyuWang/neutron,CiscoSystems/vespa,Juniper/contrail-dev-neutron,vivekanand1101/neutron,cernops/neutron,yamahata/neutron,takeshineshiro/neutron,apporc/neutron,dims/neutron,rdo-management/neutron,vivekanand1101/neutron,yuewko/neutron,chitr/neutron,pnavarro/neutron,huntxu/neutron,CiscoSystems/vespa,cloudbase/neutron,huntxu/neutron,miyakz1192/neutron,gkotton/neutron,cloudbase/neutron-virtualbox,watonyweng/neutron,ntt-sic/neutron,Juniper/neutron,alexandrucoman/vbox-neutron-agent,igor-toga/local-snat,barnsnake351/neutron,Metaswitch/calico-neutron,Juniper/contrail-dev-neutron,beagles/neutron_hacking,MaximNevrov/neutron,yamahata/tacker,Stavitsky/neutron,mahak/neutron,vveerava/Openstack,gkotton/neutron,leeseulstack/openstack,javaos74/neutron,swdream/neutron,vijayendrabvs/ssl-neutron,cernops/neutron,Juniper/neutron,zhhf/charging,shahbazn/neutron,cisco-openstack/neutron,blueboxgroup/neutron,blueboxgroup/neutron,Metaswitch/calico-neutron,yamahata/tacker,wolverineav/neutron,eayunstack/neutron,jumpojoy/neutron,dhanunjaya/neutron,neoareslinux/neutron,glove747/liberty-neutron,projectcalico/calico-neutron,gopal1cloud/neutron,sajuptpm/neutron-ipam,Stavitsky/neutron,wenhuizhang/neutron,projectcalico/calico-neutron,Juniper/neutron,leeseulstack/openstack,Comcast/neutron,virtualopensystems/neutron,gkotton/neutron,wenhuizhang/neutron,mattt416/neutron,suneeth51/neutron,infobloxopen/neutron,zhhf/charging,silenci/neutron,wolverineav/neutron,mattt416/neutron,eonpatapon/neutron,suneeth51/neutron,blueboxgroup/neutron,watonyweng/neutron,sebrandon1/neutron,vijayendrabvs/hap,Juniper/contrail-dev-neutron,skyddv/neutron,bigswitch/neutron,SamYaple/neutron,antonioUnina/neutron,yamahata/neutron,yamahata/neutron,NeCTAR-RC/neutron,gopal1cloud/neutron,jacknjzhou/neutron,SmartInfrastructures/neutron,leeseuljeong/leeseulstack_neutron,mmnelemane/neutron,waltBB/neutron_read,eonpatapon/neutron,yuewko/neutron,beagles/neutron_hacking,vijayendrabvs/ssl-neutron,apporc/neutron,Comcast/neutron,yanheven/neutron,jumpojoy/neutron,ntt-sic/neutron,eayunstack/neutron,magic0704/neutron,leeseuljeong/leeseulstack_neutron,klmitch/neutron,takeshineshiro/neutron,Comcast/neutron,paninetworks/neutron,mahak/neutron,vveerava/Openstack,virtualopensystems/neutron,vbannai/neutron,virtualopensystems/neutron,yanheven/neutron,silenci/neutron,jacknjzhou/neutron,waltBB/neutron_read,asgard-lab/neutron,noironetworks/neutron,glove747/liberty-neutron,SamYaple/neutron,neoareslinux/neutron,SmartInfrastructures/neutron,mandeepdhami/neutron,JioCloud/neutron