partly revert commit 3c16ac0 to pass legacy tests

all this code will be replaced/removed as soon as the native library is fully validated

Author: facchinm

arduino-core/src/processing/app/linux/UDevAdmParser.java

@@ -12,13 +12,8 @@ public String extractVIDAndPID(String output) throws IOException {
 
     Object vid = properties.get("ID_VENDOR_ID");
     Object pid = properties.get("ID_MODEL_ID");
-    Object serial = properties.get("ID_SERIAL_SHORT");
     if (vid == null || pid == null)
       return null;
-    if (serial == null) {
-        serial = "";
-    }
-    return ("0x" + vid + "_0x" + pid).toUpperCase() + "_" + serial;
+    return ("0x" + vid + "_0x" + pid).toUpperCase();
   }
-
 }

arduino-core/src/processing/app/macosx/SystemProfilerParser.java

@@ -81,7 +81,7 @@ public String extractVIDAndPID(String output, String serial) throws IOException
           String computedDevicePathMinusChar = computedDevicePath.substring(0, computedDevicePath.length() - 1);
           String serialMinusChar = serial.substring(0, serial.length() - 1);
           if (computedDevicePath.equalsIgnoreCase(serial) || computedDevicePathMinusChar.equalsIgnoreCase(serialMinusChar)) {
-            return (device.get(VID) + "_" + device.get(PID)).toUpperCase() + "_" + device.get(SERIAL_NUMBER);
+            return (device.get(VID) + "_" + device.get(PID)).toUpperCase();
           }
         }
         device = new HashMap<>();

arduino-core/src/processing/app/windows/ListComPortsParser.java

@@ -59,9 +59,8 @@ public String extractVIDAndPID(String output, String serial) throws IOException
         String vidPidPart = lineParts[lineParts.length - 1];
         Matcher vidMatcher = vidRegExp.matcher(vidPidPart);
         Matcher pidMatcher = pidRegExp.matcher(vidPidPart);
-        String iSerial = vidPidPart.substring(vidPidPart.lastIndexOf("\\")+1);
         if (vidMatcher.find() && pidMatcher.find()) {
-          return ("0x" + vidMatcher.group(1) + "_0x" + pidMatcher.group(1)).toUpperCase() + "_" + iSerial;
+          return ("0x" + vidMatcher.group(1) + "_0x" + pidMatcher.group(1)).toUpperCase();
         }
       }
     }