Skip python34 job for doc-only nova changes
Skip python34 job for doc-only nova changes

This change skips nova-python34 job for doc-only nova changes
(other non-doc jobs[1] are already skipped).

[1] nova-(tox-functional|python27)

Change-Id: I9a147fcaeb501023959be74b7084d5162c73cba5

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