Log Message:
Update py-simpy to 2.1.0.
Based on PR#43410 by Wen Heping.
* add math to CATEGORIES.
* set LICENSE=gnu-lgpl-v2.1.
* add PyPi to MASTER_SITES.
* fixes test target.
* simplify PKGNAME.

Major changes from 2.0.1 are:
* A SimPy debugger which allows users to interactively step through their
  simulation models. Not just for debugging, but also great for learning and
  teaching SimPy!
* A new document, describing API and tools for gaining insight into and
  debugging SimPy models.
* Two tutorials showing the use of SimPy's advanced object oriented API.