(#11276) Execute puppet module tool pack & unpack on agents

Previously, all of the module tool acceptance tests run on the master,
which is never windows.

This commit adds two acceptance tests to ensure the module tool can
generate, build, and install modules from the pmtacceptance forge, which
exercise the pack & unpack functionality.
(#11276) Fix require ordering issue on Windows

Make sure we require msvcrt/buffer is required before using it.