Fixed QDnsHeader {set,is}Query methods and associated tests

src/modules/dns-base/src/QDnsHeader.cpp

 
         bool QDnsHeader::isQuery() const
         {
-            return (bool) getFlagBits(0, 1);
+            return !(bool) getFlagBits(0, 1);
         }
 
         void QDnsHeader::setIsQuery(bool isQuery)
         {
-            setFlagBits(0, (quint8) isQuery, 1);
+            setFlagBits(0, (quint8) !isQuery, 1);
         }
 
         quint8 QDnsHeader::getOpcode() const

src/modules/dns-base/tests/DnsHeader.cpp

                                                      0x3cdc,
 
                                                      0x0100,
-                                                     false,
+                                                     true,
                                                      0,
                                                      false,
                                                      false,
                                                      "3c dc 81 80 00 01 00 01  00 00 00 00",
                                                      0x3cdc,
                                                      0x8180,
-                                                     true,
+                                                     false,
                                                      0,
                                                      false,
                                                      false,
                                                      "3c dc aa aa aa aa 55 55  55 ff ff 55",
                                                      0x3cdc,
                                                      0xaaaa,
-                                                     true,
+                                                     false,
                                                      5,
                                                      false,
                                                      true,
                                                      "3c dc 55 55 55 ff aa aa  ff 55 55 55",
                                                      0x3cdc,
                                                      0x5555,
-                                                     false,
+                                                     true,
                                                      10,
                                                      true,
                                                      false,