this changes most visble uses of master/slave terminology in tests.sh
and most uses of 'type master' or 'type slave' in named.conf files.
files in the checkconf test were not updated in order to confirm that
the old syntax still works. rpzrecurse was also left mostly unchanged
to avoid interference with DNSRPS.
CNAME between to served zones when recursion was
desired and available (RD=1, RA=1). Don't return
the CNAME target otherwise to prevent accidental
cache poisoning. [RT #47078]
