Remove trailing whitespace.

Signed-off-by: Matt Kangas <matt.kangas@mongodb.com>
SERVER-10740 Generate test result report from smoke.py

smoke.py could optionally output a test report to a file. This should be
an json summary of a test suite run, so MCI can report on specific failed
tests.
The following command could generate a detailed test report in json
format. smoke-last.json will have the details as well.
smoke.py --report-file <report-file-path>

Signed-off-by: Matt Kangas <matt.kangas@mongodb.com>