force releasenotes warnings to be treated as errors
force releasenotes warnings to be treated as errors

Change-Id: I48ecfbd8992a81fe13838e6c353195188f7cb3cd
Related-Bug: #1519912

mahak/neutron,dims/neutron,MaximNevrov/neutron,bigswitch/neutron,igor-toga/local-snat,wolverineav/neutron,apporc/neutron,huntxu/neutron,sebrandon1/neutron,mahak/neutron,klmitch/neutron,noironetworks/neutron,bigswitch/neutron,eayunstack/neutron,wolverineav/neutron,sebrandon1/neutron,noironetworks/neutron,dims/neutron,cloudbase/neutron,MaximNevrov/neutron,eayunstack/neutron,openstack/neutron,apporc/neutron,cloudbase/neutron,igor-toga/local-snat,openstack/neutron,huntxu/neutron,openstack/neutron,mahak/neutron,klmitch/neutron