Noel Eck c6610bdf46 tests: Switch from PYTHON_EXECUTABLE to PYTHON_DEFAULT_EXECUTABLE
The DetectPython cmake script now outputs a default python executable.
Updated other cmake scripts to use this concept.  Used default where
python2/3 will work, use explicit PYTHON2/3_EXECUTABLE where an
explicit version is needed.  Also, fail if python is required and NO
version of python was found.

Signed-off-by: Noel Eck <noel.eck@intel.com>
2016-10-05 17:12:02 -07:00
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