Put py34 first in the env order of tox .
Put py34 first in the env order of tox .

To solve the problem of "db type could not be determined" on py34 we
have to run first the py34 env to, then, run py27.

Change-Id: I13f5fde3d8a8bf7a6de9ac7b0dd827ae381b52f2
Closes-Bug: #1489059

openstack/python-ironicclient,NaohiroTamura/python-ironicclient,NaohiroTamura/python-ironicclient,openstack/python-ironicclient