Use quote from six.moves.urllib.parse since six.moves.urllib has no attribute/function quote.

[adrianschulz]

I noticed that it's not possible to access a page with the token-URL because you get the following error message.

Traceback (innermost last):
  Module ZPublisher.WSGIPublisher, line 156, in transaction_pubevents
  Module ZPublisher.WSGIPublisher, line 338, in publish_module
  Module ZPublisher.WSGIPublisher, line 244, in publish
  Module ZPublisher.BaseRequest, line 627, in traverse
  Module Products.PluggableAuthService.PluggableAuthService, line 263, in validate
  Module Products.PluggableAuthService.PluggableAuthService, line 826, in _authorizeUser
  Module Products.PlonePAS.plugins.ufactory, line 192, in allowed
  Module plone.memoize.volatile, line 73, in replacement
  Module borg.localrole.workspace, line 476, in checkLocalRolesAllowed
  Module redomino.tokenrole.tokenroleprovider, line 124, in getRoles
AttributeError: module 'six.moves.urllib' has no attribute 'quote'

Since this is part of the migration to Python3 (with Plone5.2) I suggest merging it into the plone52-Branch.

Would you mind reviewing my change @tomgross ?

[coveralls]

Coverage remained the same at 70.022% when pulling 5be78be on six-moves-urllib-quote into 41f4e9c on plone52.

[tomgross]

According to the documentation (https://six.readthedocs.io/#module-six.moves.urllib.parse) this looks like the right thing to do. Thanks @adrianschulz !