add logging.debug to enviroment.run to print debug info
Merge pull request #164 from wangjild/master

add logging.debug to enviroment.run to print debug info
Deflake file open for framework.Tailer.

It might take some time for the desired log file to appear, even after
the process in question has started. We should wait for it so we're less
flaky.
Merge pull request #165 from youtube/deflake-tailer-open

Deflake file open for framework.Tailer.