(PCP-896) Rm server setup from proxy test
(PCP-896) Rm server setup from proxy test

This commit removes the puppetserver setup steps from the
`proxy_connection` test.  It updates the test to use the pre-configured
"bolt" environment that is created in the beaker setup stage.

puppetlabs/pxp-agent,puppetlabs/pxp-agent,puppetlabs/pxp-agent