tor: Check if Onion service is version 3

• Only diagnose relay ports if feature enabled
• Check that the Onion service hostname contains 56 bytes before the .onion.
• Rename Hidden service to Onion service.

Helps: #2104

Tests:

• With relay enable, relay port diagnostic is passed.
• With relay disabled, relay port diagnostic is skipped.
• With bridge relay enabled, obfs ports diagnostics are passed.
• With bridge relay disabled, obfs ports diagnostics are skipped.
• With Onion service enabled, v3 check is passed.
• With Onion service disabled, v3 check is skipped.

Signed-off-by: James Valleroy jvalleroy@mailbox.org