Cleanup AppVeyor config: power shell test runner
Cleanup AppVeyor config: power shell test runner

Regroup powershell code into 3 blocks:
1. run tests
2. Upload results
3. Exit script

py.test is in PATH (like pylint and pip), so we can simplify that
command

webmaster128/clcache,webmaster128/clcache,webmaster128/clcache