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>