Stop trying to close the open process

execute_to_log tries to be good and clean up the open file descriptors.
However it would also try and close the subprocess which cleans itself
up. Avoid "IOError: [Errno 9] Bad file descriptor" by skipping over the
subprocess file descriptor.

Change-Id: Iae7d21bbacd07f487fb56592ea12cbd4edb06ca4
Merge "Stop trying to close the open process"