scripts: python3: use new style except statement

Changed old syle except statements 'except <exception>, var'
to new style 'except <exception> as var' as old style is not
supported in python3.

(From OE-Core rev: 438eabc248f272e3d272aecaa4c9cec177b172d5)

Signed-off-by: Ed Bartosh <ed.bartosh@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

scripts/cp-noerror

@@ -33,16 +33,16 @@ def copytree(src, dst, symlinks=False, ignore=None):
                 shutil.copy2(srcname, dstname)
         # catch the Error from the recursive copytree so that we can
         # continue with other files
-        except shutil.Error, err:
+        except shutil.Error as err:
             errors.extend(err.args[0])
-        except EnvironmentError, why:
+        except EnvironmentError as why:
             errors.append((srcname, dstname, str(why)))
     try:
         shutil.copystat(src, dst)
-    except OSError, why:
+    except OSError as why:
         errors.extend((src, dst, str(why)))
     if errors:
-        raise shutil.Error, errors
+        raise shutil.Error(errors)
 
 try:
     copytree(sys.argv[1], sys.argv[2])