dnssec-coverage: fix handling of zones without trailing dots

After change 5143, zones listed on the command line without trailing
dots were ignored.

bin/tests/system/coverage/clean.sh

@@ -13,4 +13,5 @@ rm -f named-compilezone
 rm -f */K*.key
 rm -f */K*.private
 rm -rf coverage.*
+rm -rf dotted-dotless
 rm -f ns*/named.lock

bin/tests/system/coverage/tests.sh

@@ -81,5 +81,17 @@ for dir in [0-9][0-9]-*; do
         status=`expr $status + $ret`
 done
 
+dir=dotted-dotless
+[ -d $dir ] || mkdir $dir
+echo_i "$dir"
+zsk1=`$KEYGEN -q -K $dir -a rsasha256 one.example`
+zsk2=`$KEYGEN -q -K $dir -a rsasha256 two.example`
+$COVERAGE -K $dir one.example. two.example > coverage.$n 2>&1
+grep one.example coverage.$n >/dev/null 2>&1 || ret=1
+grep two.example coverage.$n >/dev/null 2>&1 || ret=1
+n=`expr $n + 1`
+if [ $ret != 0 ]; then echo_i "failed"; fi
+status=`expr $status + $ret`
+
 echo_i "exit status: $status"
 [ $status -eq 0 ] || exit 1