django: email and nntp tools

Baptiste Beauplatrequested to merge
lyknode/debexpo:dj/email into django

This MR relates to #47 (closed).

Email handling are a requirements for user creation (used for confirmation). This MR re-add the Email class, with some improvements:

  • NNTP and SMTP code are split in tow classes (Email and NNTPClient)
  • Tests for both added
  • Tests for NNTP are network dependent:
    • Disabled in gitlab CI (won't connect to the NNTP server) and excluded from coverage
    • Dynamic detection otherwise
  • Fix wrong settings used in gitlab CI
  • Base email template converted to django

Email template are meant to be stored per-app. The base template living in the base app.

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