Rename domain names to provide a 'secure context'

[guusdk]

Many (web) clients features depend (or should depend) on being executed in a secure context (eg, accessed over an encrypted connection, or on localhost). See https://developer.mozilla.org/en-US/docs/Web/Security/Secure_Contexts for details.

The domains used by this project do not automatically qualify as a secure context. This can make interacting with it from a webclient troublesome. We should consider renaming the domain names like xmpp1.localhost.example to something that does define as a ‘secure context’, such as xmpp1.example.localhost

See https://igniterealtime.atlassian.net/browse/OF-2574