D6977: servertest: add NNTP support

[Pino Toscano]

pino added inline comments.

INLINE COMMENTS

> mlaurent wrote in servertest.cpp:422
> So we can use a reference not necessary a pointer where we need to check with Q_ASSERT if it's empty or not
> and we don't need to use *stage == ... no ?

The pointer instead of the reference makes it more clear it **is** subject to change, which is not when using a reference.  This is also the case for the `shouldStartTLS` parameter, in both the `handlePopConversation` function (already existing), and the `handleNntpConversation` which I added.

REPOSITORY
  R84 PIM: KMail Transport

REVISION DETAIL
  https://phabricator.kde.org/D6977

To: pino, #kde_pim, mlaurent
Cc: dvasin, winterz, vkrause, mlaurent, knauss, dvratil
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