Delete legacy routes to handle puppet agents < 4

Puppet 3 has been EOL'ed for years. The legacy routes were added to support migration from 3 to newer versions due to the REST request path changing from /:environment/:indirection/:name to /puppet/v3/:indirection/:name?environment=:environment. We should make the backing code "dead"by removing the service from the bootstrap config.

This entails

• updating the fixture file we ship with FOSS
• Fixing any tests that fail as a result of these changes

For propagating this to PE, see PE-30415.