Run autotests in Qt5 CI

All autotests should be running in Qt5 CI.

I would like to do this a bit differently than for Qt4.

The Qt4 way:

• compile, run all autotests via (private) scripts
• get results in testlib XML files
• upload results to (private) database
• download results from (private) database frontend
• subtract results for tests marked as unstable in a (private) blacklist
• compare munged results against last results from (private) database, consider test run "successful" iff no new regressions appeared

The Qt5 way should be:

• compile, run all autotests, via scripts in public qtqa module
  • leveraging build system as much as possible (i.e. `make -j1 -k check')
• test output goes to two places: stdout as plain text, and to XML log files
• any test exiting with a non-zero exit code means the test run fails
• unstable tests are handled by marking them as unstable directly in the source (e.g. by extending QEXPECT_FAIL)
  • unstable tests which may crash may need something more, e.g. CONFIG+=insignificant_test in .pro file
• XML log files may be uploaded to (private and/or public) results handling systems
  • only for gathering of metrics - test results database no longer handles any regression detection logic

Probably the best way to get this going is to pick a small module (qtsvg ?) where all the tests are stable and passing, and implement the basic test running for that module first, then gradually extend to other modules.