Split up tests into even buckets based on a junit xml file.
./tsplit/tsplit.py -g 10 -o tests/test_data/GROUP tests/test_data/report.xml
-g --groups NUMBER Number of groups to split the tests into. Defaults to 4.
-o --output PREFIX Output to file with the given prefix followed by the number. E.g. GROUP would output [ GROUP1, GROUP2, GROUP3, GROUP4 ]
-e --env PREFIX Output to an enviroment variable with the given prefix followed by the number. See above.