Add pyhton to PATH for Windows slaves
Add pyhton to PATH for Windows slaves

Change-Id: Ie2facbd80255f95e8f36a0f09cfa21b43e9abcb2

bazelbuild/continuous-integration,bazelbuild/continuous-integration,bazelbuild/continuous-integration,bazelbuild/continuous-integration,bazelbuild/continuous-integration,bazelbuild/continuous-integration,bazelbuild/continuous-integration,bazelbuild/continuous-integration