Cleanup cms run analysis.py (#7681)

* expand tar files in user sandbox. Fix #7661

* remove unused prepSandbox

* many pylint fixes

* do not use encoding when opening binary files

* Revert "remove unused prepSandbox"

This reverts commit 856ac04.

* pylint

* add back lost blank

* stop using WMTaskSpace

* remove obsolete code

* simplify timestamp reporting