using unbound-checkconf

[A. Schulze via Unbound-users]

Hello,

unbound-checkconf /path/to/unbound.con -o [option] should echo the option value.
That happen for all options valid in "server:" section as well as in "control:" 
section.

But if I check for "dnstap-enable" (or "dnscrypt-enable") unbound-checkconf 
fail.
... fatal error: cannot print option 'dnstap-enable'

dnstap is compiled in and do work as expected. But I can't query the state 
using unbound-checkconf.
(tested with 1.6.2rc1)

Andreas