Merge pull request #2 from stronk7/MDLSITE-2114

MDLSITE-2114 - Delete 20_STABLE from local_ci scripts
MDLSITE-2101 Skip tests dirs wo unit test files
Merge pull request #3 from stronk7/MDLSITE-2101

MDLSITE-2101 Skip tests dirs wo unit test files
MDL-38040 Detect CRLFs with the illegal_whitespace job.