Update neutron-client minimum to 2.3.4

Closes-bug:1280941
Change-Id: I1de211c0920e629621a64caefc2a639769e32425
Update openstack-doc-tools to 0.7.1

We now need at least version 0.7.1 of openstack-doc-tools.

Change-Id: Ie449294e5e7a7a6758969857c878953718d0320c
Merge "Update neutron-client minimum to 2.3.4"
Merge "Update openstack-doc-tools to 0.7.1"