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: I7b131f9099d092e479ab294c52943b9420788148
Co-Authored-By: LiZekun <12319a490d3a24c9363e138db0845865f3f9d61f@qq.com>

openstack/puppet-ceph,openstack/puppet-ceph