Allow import more than one func from i18n
Allow import more than one func from i18n

According to OpenStack guidelines[1], importing more than
one module per line is allowed if it's function from i18n module.

[1]  http://docs.openstack.org/developer/hacking/#imports

Change-Id: I10e90e8f6a4a3f9c161bbaffb030d3fbc9f8499b

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