remove unicode literal from code
remove unicode literal from code

All strings are considered as unicode string from Python 3.

This patch drops the explicit unicode literal (u'...')
appearances from the unicode strings.

Change-Id: Ie234cb80228e84aef870c64e9614600d4855d207
Co-Authored-By: LiZekun <12319a490d3a24c9363e138db0845865f3f9d61f@qq.com>

openstack/puppet-neutron,openstack/puppet-neutron