Refactor WiFi config code

Author: sebromero

libraries/WiFi/src/WiFi.cpp

@@ -86,8 +86,7 @@ void arduino::WiFiClass::config(const char *local_ip){
 
 void arduino::WiFiClass::config(IPAddress local_ip, IPAddress dns_server){
     config(local_ip);
-    nsapi_addr_t convertedDNSServer = {NSAPI_IPv4, {dns_server[0], dns_server[1], dns_server[2], dns_server[3]}};    
-    _dnsServer1 = SocketAddress(convertedDNSServer);
+    setDNS(dns_server);    
 }
 
 void arduino::WiFiClass::config(IPAddress local_ip, IPAddress dns_server, IPAddress gateway){
@@ -108,8 +107,7 @@ void arduino::WiFiClass::setDNS(IPAddress dns_server1){
 }
 
 void arduino::WiFiClass::setDNS(IPAddress dns_server1, IPAddress dns_server2){
-    nsapi_addr_t convertedDNSServer1 = {NSAPI_IPv4, {dns_server1[0], dns_server1[1], dns_server1[2], dns_server1[3]}};    
-    _dnsServer1 = SocketAddress(convertedDNSServer1);
+    setDNS(dns_server1);
     nsapi_addr_t convertedDNSServer2 = {NSAPI_IPv4, {dns_server2[0], dns_server2[1], dns_server2[2], dns_server2[3]}};    
     _dnsServer2 = SocketAddress(convertedDNSServer2);    
 }