Add .gitignore for regression-tests.
Add .gitignore for regression-tests.

shaunstanislaus/Doradus,dell-oss/Doradus,shaunstanislaus/Doradus,kod3r/Doradus,dell-oss/Doradus,kod3r/Doradus,dell-oss/Doradus,kod3r/Doradus,shaunstanislaus/Doradus