Add files created by test run to .gitignore (#4079)
Add files created by test run to .gitignore (#4079)

Running the tests on a clean checkout should keep the tree clean
cseed/hail,hail-is/hail,cseed/hail,danking/hail,hail-is/hail,cseed/hail,danking/hail,danking/hail,danking/hail,cseed/hail,hail-is/hail,danking/hail,hail-is/hail,hail-is/hail,cseed/hail,danking/hail,hail-is/hail,cseed/hail,hail-is/hail,cseed/hail,danking/hail,danking/hail,cseed/hail,hail-is/hail