(maint) Static test certs should exist at static filenames

[Iristyle]

• To be consistent with changes to ssl.sh that produce files named:

  server.key - for private key server.crt - for certificate server.pub - for public key

  Store copies of existing cert files with those names in the repo.

  This is necessary for tests to pass since all containers have been updated to use filenames that no longer include the $CERTNAME

  With the real ssl.sh script, these files are symlinks. However, storing symlinks in a git repo doesn't work in a Windows environment, so for preloaded certs, use file copies instead

This is being vetted at https://github.com/puppetlabs/pupperware-commercial/pull/73 by referring to this branch

[Iristyle]

Verified using the pupperware-commercial repo PR at https://github.com/puppetlabs/pupperware-commercial/pull/73