Make gate-networking-ofagent-python34 non-voting
Make gate-networking-ofagent-python34 non-voting

Add python3 job for ofagent.
Add only a check because of a non-voting job.

Closes-Bug: #1470344
Change-Id: I63b067a0856679cfe32e247661ed61a65aaaa126

Tesora/tesora-project-config,coolsvap/project-config,noorul/os-project-config,dongwenjuan/project-config,openstack-infra/project-config,anbangr/osci-project-config,openstack-infra/project-config,Tesora/tesora-project-config,anbangr/osci-project-config,coolsvap/project-config,dongwenjuan/project-config,noorul/os-project-config