If the tests are interrupted at the right point a passt.pid file can be
left over. Clean it up with "make clean" and add it to .gitignore so it
doesn't get accidentally committed.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Ignore various files generated during build or test.
Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>