D10218: Fix bug in parsing dates that fall in the DST "non existant hour"

[Albert Astals Cid]

aacid created this revision.
aacid added a reviewer: mlaurent.
Restricted Application added a project: KDE PIM.
Restricted Application added a subscriber: KDE PIM.
aacid requested review of this revision.

REVISION SUMMARY
  The old code was creating a datetime from maybeDate + maybeTime
  but that meant that it could be creating a datetime that never
  existed if that datetime falls in the time that jumps to the
  future when doing dst (i.e 2->3 am)

TEST PLAN
  Added new test that fails without my patch and works with it

REPOSITORY
  R180 PIM: KMime

BRANCH
  Applications/17.12

REVISION DETAIL
  https://phabricator.kde.org/D10218

AFFECTED FILES
  autotests/headertest.cpp
  src/kmime_header_parsing.cpp

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