some py3 fixes

plone/app/discussion/browser/comment.py

@@ -2,7 +2,7 @@
 from AccessControl import getSecurityManager
 from Acquisition import aq_inner
 from Acquisition import aq_parent
-from comments import CommentForm
+from .comments import CommentForm
 from plone.app.discussion import _
 from plone.registry.interfaces import IRegistry
 from plone.z3cform.layout import wrap_form

plone/app/discussion/browser/comments.py

@@ -19,7 +19,7 @@ from plone.z3cform.interfaces import IWrappedForm
 from Products.CMFCore.utils import getToolByName
 from Products.Five.browser.pagetemplatefile import ViewPageTemplateFile
 from Products.statusmessages.interfaces import IStatusMessage
-from urllib import quote as url_quote
+from six.moves.urllib.parse import quote
 from z3c.form import button
 from z3c.form import field
 from z3c.form import form
@@ -537,7 +537,7 @@ class CommentsViewlet(ViewletBase):
     def login_action(self):
         return '{0}/login_form?came_from={1}'.format(
             self.navigation_root_url,
-            url_quote(self.request.get('URL', '')),
+            quote(self.request.get('URL', '')),
         )
 
     def format_time(self, time):