* rollback ds config changes

* fix format

* Fix error when output_file is a relative path without a prefix (#2397)
Co-authored-by: NBenjamin Steenhoek <benjaminjsteenhoek@gmail.com>

* fix restuls and exprs path to use absolute path

* use base64 encoded ds config as cmd arg

* fix format

* remove assert

* write out optimial config after tuning

* fix format

* no need to update ds config path when encoding ds config

* udpate

* do not use abs path for result and expr dir

* fix conflicts

* fix run mode

* fix format

* fix format
Co-authored-by: NBenjamin Steenhoek <benjaminjsteenhoek@gmail.com>
Co-authored-by: NOlatunji Ruwase <olruwase@microsoft.com>