Rename modules and export all restobjects from top level API.

Abhilash Rajrequested to merge
maxking/mailmanclient:master into master

Change some module names:

  • mailmanclient.restobjects.list_archiver -> mailmanclient.restobjects.archiver
  • mailmanclient.restobjects.list -> mailmanclient.restobjects.mailinglist

Fix imports for the above two changes and export all the classes under restobjects to top level mailmanclient so that they are now a part of the public API.

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