D6979: in automatic tests, find python interpreter and use it for python test scripts

[David Faure]

dfaure accepted this revision.
This revision is now accepted and ready to land.

REPOSITORY
  R286 KFileMetaData

BRANCH
  upstream

REVISION DETAIL
  https://phabricator.kde.org/D6979

To: mgallien, aacid, awilcox, #frameworks, dfaure
Cc: #frameworks