goofy: Remove /var/log/connectivity.bak periodically

Also fixed lint error in goofy.

BUG=chrome-os-partner:18548
TEST=set sync_log_period_sec in test_list,
  run goofy, check /var/log/connectivity.bak is removed periodically

Change-Id: I3b458fd711c2eb5908018d730658c2ec9137bb30
Reviewed-on: https://gerrit.chromium.org/gerrit/50168
Reviewed-by: Vic Yang <victoryang@chromium.org>
Commit-Queue: Cheng-Yi Chiang <cychiang@chromium.org>
Tested-by: Cheng-Yi Chiang <cychiang@chromium.org>
2 files changed