ctp:autopos: add log method to manage output

1) Add log() method to manage output uniformly.
2) Support to use the log interface of a strategy.

Signed-off-by: Zhengwang Ruan <ruan.zhengwang@gmail.com>
strategy:futures: enable ctpPos to use strategy's log interface

Enable ctpPos to use strategy's log interface, so we can see the
details while changing positions.

Signed-off-by: Zhengwang Ruan <ruan.zhengwang@gmail.com>
strategy/turtle: fix can not set up trading after reached start time

Update moveToNextTick() to fall in a loop and wait till start time comes.

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