Fixed UnicodeDecodeError while uploading changes.

When commit with comment that has non-ASCII characters,
UnicodeDecodeError will be raised
while uploading multiple project/branch changes.
Because some strings in script are not str type, but unicode.
So all the strings are decoded to unicode,
and python use ascii to do this,
it can not decode non-ASCII characters,
so UnicodeDecodeError raised.

Signed-off-by: chenguodong <chenguodong@huawei.com>

Change-Id: I46447f489a4b9760a5899c7ba9d764b688594e46

subcmds/upload.py

@@ -215,6 +215,11 @@ Gerrit Code Review:  http://code.google.com/p/gerrit/
       branches[project.name] = b
     script.append('')
 
+    script = [ x.encode('utf-8')
+             if issubclass(type(x), unicode)
+             else x
+             for x in script ]
+
     script = Editor.EditString("\n".join(script)).split("\n")
 
     project_re = re.compile(r'^#?\s*project\s*([^\s]+)/:$')