Remove pulp-smash from the installation scripts

[lubosmj]

This is the last step required to finish the migration off of pulp-smash.

[lubosmj]

The file plugin does not use any pulp-smash utilities after resolving https://github.com/pulp/pulp_file/issues/804. It just installs them.

[quba42]

I believe pulp_deb has removed pulp-smash with: pulp/pulp_deb#851