Comply with new hacking release

Another couple of small issues to pass all PEP8 tests in
the new hacking release

Change-Id: I0d8aebdb27b03630b6de2186d32f58b3d6a1957d

ironicclient/v1/node_shell.py

@@ -119,7 +119,7 @@ def do_node_delete(cc, args):
             cc.node.delete(n)
         except exc.HTTPNotFound:
             raise exc.CommandError(_('Node not found: %s') % n)
-        print _('Deleted node %s') % n
+        print(_('Deleted node %s') % n)
 
 
 @utils.arg('node',

tox.ini

@@ -34,3 +34,6 @@ commands = {posargs}
 ignore = E12
 builtins = _
 exclude = .venv,.git,.tox,dist,doc,*openstack/common*,*lib/python*,*egg,build,tools
+
+[hacking]
+import_exceptions = testtools.matchers