99-squash-package-install in the package-installs element does not
know which python environments the requirements were installed into.
This can cause it to select the wrong python to run the
package-installs-squash script.
Co-Authored-By: Adam Harwell <flux.adam@gmail.com>
Change-Id: I5fab0e192c3a2dad8f60e821c184479e24e33bcd