Add information for skipped commit options

The unsupported Commit-xxx option are silently skipped
and removed as 're_remove=Commit-\w*', this patch adds
warning message in this case to detect misspelled issue
for the 2 supported options:
  Commit-notes:
  Commit-changes:

For example: the final 's' is missing (Commit-note:)

NB: no issue for Series-xxx option as only the supported
    options are accepted (see valid_series in series.py)

Signed-off-by: Patrick Delaunay <patrick.delaunay@st.com>
Reviewed-by: Simon Glass <sjg@chromium.org>

tools/patman/patchstream.py

@@ -351,6 +351,9 @@ class PatchStream:
             elif name == 'changes':
                 self.in_change = 'Commit'
                 self.change_version = self.ParseVersion(value, line)
+            else:
+                self.warn.append('Line %d: Ignoring Commit-%s' %
+                    (self.linenum, name))
 
         # Detect the start of a new commit
         elif commit_match: