Fix usage of save_and_reraise_exception
Fix usage of save_and_reraise_exception

Set reraise=False for the cases where the purpose of exception
handler is to reraise proper type of exception

Change-Id: Id6595ba1e160b9033d519ded16e0fbd2f91ccb5d
Closes-Bug: #1288188

gandelman-a/neutron-lbaas,gandelman-a/neutron-lbaas,gotostack/neutron-lbaas,gotostack/neutron-lbaas,dougwig/x-neutron-lbaas,gotostack/neutron-lbaas,gandelman-a/neutron-lbaas,citrix-openstack-build/neutron-lbaas