Incorrect Property Mapping in Action Model Migration Generation

[fabiSwDevBeg]

File Affected: collective.easyform.migration.actions

During property mapping in the generation of action models, the property xinfo_headers should use append_list_node instead of append_node.

Expected Behavior:
The current implementation appears to handle it as:

<xinfo_headers>
    <element>HTTP_X_FORWARDED_FOR</element>
</xinfo_headers>

Current Behavior:
The XML definition for xinfo_headers is generated from the migration script as:

<xinfo_headers>
    HTTP_X_FORWARDED_FOR
</xinfo_headers>

Since this is a list-based property (with <element> nodes), append_list_node should be used instead of append_node for correct parsing.