"check-names primary" and "check-names secondary" were ignored

these keywords were added to the parser as synonyms for "master"
and "slave" but were never hooked in to the configuration of named,
so they were ignored. this has been fixed and the option is now
checked for correctness.

(cherry picked from commit ba31b189b4)

bin/tests/system/checknames/tests.sh

@@ -127,7 +127,7 @@ if [ $ret != 0 ]; then echo_i "failed"; fi
 status=`expr $status + $ret`
 n=`expr $n + 1`
 
-echo_i "check that updates to 'check-names master ignore;' succeed and are not logged ($n)"
+echo_i "check that updates to 'check-names primary ignore;' succeed and are not logged ($n)"
 ret=0
 not=1
 $NSUPDATE -d <<END > nsupdate.out.test$n 2>&1 || ret=1