Update to 4.1.6

Major Bug Bug Fixes:

• This release fixes segfault after start when many interfaces are in use.
• This version returns the EDNS bad version response with the AD flag unset for improved conformance.

Minor Buf Fixes:

• Fix #701: Fix that AD=1 set in a BADVERS response.
• Fix typo in zonec.c inside error message.
• Fix #711: Document that debug-mode yes is used for staying attached to the supervisor console.
• Document verbosity 3 prints more information.
• nsd-checkconf warns for master zones with no zonefile statement.
• Fix start failure when many file descriptors are in use.
• The servfail rcode is not printed with a space in the middle.
• print failed token for config syntax error or parse error.

PR: 204533
Submitted by: Jaap Akkerhuis <jaap@NLnetLabs.nl> (maintainer)
Sponsored by: DK Hostmaster A/S