Foreman » Smart Proxy

Fixes #7849 - re-factor trusted_hosts handling

On HTTPS we will get the FQDN from the client certificate and check against the
list.

While on HTTP we will perform both reverse DNS and forward DNS lookup to verify
the client may talk to us.

Additionally the forward_verify of DNS can be disabled.

Fixes #8853 - Actually redirect stderr to proxy error log

according to comment.

fixes #8811 - refactor per-module enabling of http(s) to http(s)_rackup

Fixes #8748 - Allow per-module enabling of http(s)

Fixes #8210 - Adding caching for smart-proxy puppet classes using Stefan Julin's implementation of cache

Refs #969 - Proxy-side changes for serving templates from the proxy

An update to @GregSutcliffe's original PR. Ports his original feature to the new
plugin api.

Fixes #8006 - added STDOUT proxy log option

Fixes #7922 - promote uri and http to instance property

This will allow to re-use existing http connection for subsequent
requests.

fixes #7660: fixes first bunch of rubocop warnings

Fixes #7749 - allow using logger in log_halt helper