Pipe input to integration test subprocess

Currently when an atest command running in integration test stops at waiting for user input, it hangs there forever. This CL pipes the outout of 'yes' command to the stdin of the atest subprocess so that tests won't gets stuck waiting for user input.

Test: python atest_dry_run_diff_tests
Change-Id: Ib84599c09cd5c69f3daf89fa141ece76421b3306
2 files changed