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This reverts commit e15cd5ec.

One of the plugins links against KIOWidgets, which means that CMake will
fail configuration if KIO is not found.

GIT_SILENT

And one other minor optimisation.

Reviewers: mlaurent

Reviewed By: mlaurent

Subscribers: anthonyfieroni, kde-pim

Tags: #kde_pim

Differential Revision: https://phabricator.kde.org/D28011

Some other IMAP services are offering XOAUTH2 method, but we only
support OAuth on Gmail at the moment.

Port 25 is generally used for MTA-MTA communication, while port 587 should be
used for email submission by MUAs (and major services like gmail don't even listen
on port 25 anymore). The ServerTest will still fall back to trying port 25 if
it fails to connect on port 587 to keep supporting anctient and misconfigured
SMTP servers.

Summary:
Add the defines for the NNTP/NNTPS strings and ports;, implement the
basic conversation to get the capabilities of the server (if supported),
to know whether TLS is supported, and which authentication methods are
available.

Test Plan:
Run the `servertest` with some NNTP server, e.g. news.gmane.org,
nntp.perl.org, news.mozilla.org.

Reviewers: #kde_pim, mlaurent

Reviewed By: #kde_pim, mlaurent

Tags: #kde_pim

Differential Revision: https://phabricator.kde.org/D6977

Commit 351a0ce3, which switched from
QList to QVector, also switched a QSet to QVector: this gives as result
duplicate items for the connection results.

Since having duplicate items does not make sense, then switch the
internal storage back to QSet, manually converting it to the QVector
that is emitted as parameter of the finished signal.

Testing multiple protocols and set custom ports for some protocols. Than
you want to have the default ports, if you cange to another protocol.

Conflicts:
	mailtransport/servertest.cpp

Sandro Knauß authored Jan 10, 2015 and Christian Mollekopf committed Apr 15, 2015

Submission 587 has no SSL port, so the secure part must be deactivated.

KOLAB: 1862

Conflicts:
	mailtransport/servertest.cpp
	mailtransport/socket.cpp