Fix DNS multiple query hints to perform both IP4 and IP6 tests

Author: tymoteuszblochmobica

TESTS/netsocket/dns/asynchronous_dns_multi_ip.cpp

@@ -58,7 +58,7 @@ void do_getaddrinfo_async(const char hosts[][DNS_TEST_HOST_LEN], unsigned int op
     // Create callback semaphore and data
     rtos::Semaphore semaphore;
     dns_application_data_multi_ip *data = new dns_application_data_multi_ip[op_count];
-    SocketAddress hints{{NSAPI_IPv4}, 80};
+    SocketAddress hints{{NSAPI_UNSPEC}, 80};
 
     unsigned int count = 0;
     for (unsigned int i = 0; i < op_count; i++) {

TESTS/netsocket/dns/synchronous_dns_multi_ip.cpp

@@ -42,7 +42,7 @@ void do_getaddrinfo(const char hosts[][DNS_TEST_HOST_LEN], unsigned int op_count
     (*exp_dns_failure) = 0;
     (*exp_timeout) = 0;
 
-    SocketAddress hints{{NSAPI_IPv4}, 80};
+    SocketAddress hints{{NSAPI_UNSPEC}, 80};
     for (unsigned int i = 0; i < op_count; i++) {
         SocketAddress *result;
         nsapi_error_t err = NetworkInterface::get_default_instance()->get_default_instance()->getaddrinfo(hosts[i], &hints, &result);