flimflam-test: Fix small pylint errors in more scripts

Mostly fix extra imports, rename some variables that redefined python
keywords, and remove semi-colons.

BUG=chromium-os:38166
TEST=Pylint whines less.

Change-Id: I4504f78ac1dd58c6e41199367fd3279ada8f9f11
Reviewed-on: https://gerrit.chromium.org/gerrit/42307
Tested-by: Christopher Wiley <wiley@chromium.org>
Reviewed-by: mukesh agrawal <quiche@chromium.org>
Commit-Queue: Christopher Wiley <wiley@chromium.org>
22 files changed