Fix cachemgr 'config' report output for TLS options

Fix cachemgr 'config' report output for TLS options

Adds Security::PeerOptions::dumpCfg() method to output config
details for the peer TLS settings stored. Takes an optional
prefix string for the option parameters.
- uses prefix "" for tls_outgoing_options
- uses prefix "tls-" for https_port, http_port, and cache_peer
- displays "tls-disable" for directives without TLS settings.

Fixes missing cache_peer config output for TLS settings.

Fixes display of http(s)_port TLS settings 'ssl' prefix.

Fixes tls-min-version= internal operation to avoid polluting
tls-options= config settings.

Also, updates documentation mentions of "SSL" in debugs().