Comment 2 for bug 1708408

Reviewed: https://review.openstack.org/490705
Committed: https://git.openstack.org/cgit/openstack/python-novaclient/commit/?id=8353b3c897b5f7e5e5575c207a4f3a61beb18d53
Submitter: Jenkins
Branch: master

commit 8353b3c897b5f7e5e5575c207a4f3a61beb18d53
Author: huangtianhua <email address hidden>
Date: Fri Aug 4 10:12:16 2017 +0800

    Remove substitutions for command error msg

    For server_tag_add and server_tag_delete commands,
    the substitution in the command error message doesn't
    work, this change removes the substitutions, and to
    tell user the 'specified' tag can not be added
    or deleted is enough, like other commands do.

    Change-Id: I7a9c9103d4fc88e1b82458f6ccc9738c6aa0315c
    Closes-Bug: #1708408