As it turns out, older versions of CTest do not output a "Completion Status" for
tests that were not run, so we need a fallback. The only place for information
is the test output, which we parse for certain key phrases to detect tests that
were skipped or had missing requirements (typically due to compilation
failures).

The build directory does not really work here, because it will just be called
build-cmake. So extract it from the CI_PROJECT_NAME variable and normalize that.

- dune-ctest now writes a JUnit XML result file to Testing/cmake.xml. This can
  be picked up by GitLab for better error reporting.
- Right now, tests that fail because compilation failed are not detected as an
  error. This is fixed now.

CTest already prints the messages once.

Closes: #126

Ansgar Burchardt authored 8 years ago and Christoph Grüninger committed 8 years ago

CTest returns with an error status not only when tests failed, but also
when tests were only skipped.  This wrapper checks the log and returns
successfully if no tests failed; skipped tests do not result in an error.
This behaviour is needed in a continuous integration environment, when
building binary packages or in other cases where the testsuite should be
run automatically.

Closes issue #12