Create consistent behavior for fs module across platforms

Throw Error if path ends with `/` only on windows linux is behaving as expected.
As suggested by issues nodejs#17801

lib/fs.js

@@ -457,6 +457,12 @@ fs.readFile = function(path, options, callback) {
   if (!nullCheck(path, callback))
     return;
 
+  //doing justice between linux and windows for `/` char at the end of file path
+  if(isWindows && (path.slice(-1)==='/')){
+    throw new errors.Error('ERR_FS_EISDIR_PATH', path);
+    return;
+  }
+
   var context = new ReadFileContext(callback, options.encoding);
   context.isUserFd = isFd(path); // file descriptor ownership
   var req = new FSReqWrap();
@@ -667,6 +673,12 @@ fs.readFileSync = function(path, options) {
   var isUserFd = isFd(path); // file descriptor ownership
   var fd = isUserFd ? path : fs.openSync(path, options.flag || 'r', 0o666);
 
+  //doing justice between linux and windows for `/` char at the end of file path
+  if(isWindows && (path.slice(-1)==='/')){
+    throw new errors.Error('ERR_FS_EISDIR_PATH', path);
+    return;
+  }
+
   tryStatSync(fd, isUserFd);
   // Use stats array directly to avoid creating an fs.Stats instance just for
   // our internal use.
@@ -1517,6 +1529,12 @@ fs.writeFile = function(path, data, options, callback) {
   options = getOptions(options, { encoding: 'utf8', mode: 0o666, flag: 'w' });
   const flag = options.flag || 'w';
 
+  //doing justice between linux and windows for `/` char at the end of file path
+  if(isWindows && (path.slice(-1)==='/')){
+    throw new errors.Error('ERR_FS_EISDIR_PATH', path);
+    return;
+  }
+
   if (isFd(path)) {
     writeFd(path, true);
     return;
@@ -1543,6 +1561,12 @@ fs.writeFileSync = function(path, data, options) {
   options = getOptions(options, { encoding: 'utf8', mode: 0o666, flag: 'w' });
   const flag = options.flag || 'w';
 
+  //doing justice between linux and windows for `/` char at the end of file path
+  if(isWindows && (path.slice(-1)==='/')){
+    throw new errors.Error('ERR_FS_EISDIR_PATH', path);
+    return;
+  }
+
   var isUserFd = isFd(path); // file descriptor ownership
   var fd = isUserFd ? path : fs.openSync(path, flag, options.mode);