Removed older version of python3.x
Removed older version of python3.x

Remove the support of python3.4, because
in Ubuntu Xenial only (python3.4 is
restricted to <= Mitaka).

Change-Id: Ibcc22f7da056c1db7cb3901fd63ff40adaa0f11c
Closes-Bug:  #1801855

openstack/stackviz,openstack/stackviz,openstack/stackviz