regress: introduce regress subsystem

1) Introduce 'regress' subsystem to do regression tests.
2) Add 'runstat' module to maintain runtime statistics.

Signed-off-by: Zhengwang Ruan <ruan.zhengwang@gmail.com>
strategy:futures/turtle: add runtime stat support

Add counting runtime statistics support.

Signed-off-by: Zhengwang Ruan <ruan.zhengwang@gmail.com>
strategy:turt1: add runtime stat support

Signed-off-by: Zhengwang Ruan <ruan.zhengwang@gmail.com>
regression: add count runtime statistics support

Add count runtime statistics support.

Signed-off-by: Zhengwang Ruan <ruan.zhengwang@gmail.com>