pdnsutil {add-record,delete-rrset}: Don't append ZONE if NAME ends wi…

…th .

If a NAME ends with a . it is to be understood as an absolute name and
appending the zone is not intuitive then.

Note this changes behaviour for calls like:

	pdnsutil --config-dir=configs/auth add-record example.net . NS 1.2.3.4

which added the NS record to the zone's apex before and is likely an
error now.

Closes: PowerDNS#8595

pdns/pdnsutil.cc

@@ -1597,10 +1597,13 @@ static int addOrReplaceRecord(bool addOrReplace, const vector<string>& cmds) {
   vector<DNSResourceRecord> newrrs;
   DNSName zone(cmds.at(1));
   DNSName name;
-  if (cmds.at(2) == "@")
+  if (cmds.at(2) == "@") {
     name=zone;
-  else
+  } else if (isCanonical(cmds.at(2))) {
+    name = DNSName(cmds.at(2));
+  } else {
     name = DNSName(cmds.at(2)) + zone;
+  }
 
   rr.qtype = DNSRecordContent::TypeToNumber(cmds.at(3));
   rr.ttl = ::arg().asNum("default-ttl");
@@ -1735,10 +1738,13 @@ static int deleteRRSet(const std::string& zone_, const std::string& name_, const
   }
 
   DNSName name;
-  if(name_=="@")
+  if (name_=="@") { 
     name=zone;
-  else
+  } else if (isCanonical(name_)) {
+    name = DNSName(name_);
+  } else {
     name=DNSName(name_)+zone;
+  }
 
   QType qt(QType::chartocode(type_.c_str()));
   di.backend->startTransaction(zone, -1);