Adds a service to embindtest that implements XInvocation to handle all possible method names and returns the name as a string. A Python unit test then uses this. Without the fix pyuno would throw an exception when it tries to use the XInvocation object that doesn’t also implement XInvocation2 and return a valid reference for getIntrospection. Change-Id: Icb3359c788acd5eda37980252e5fc5c956b38100 Reviewed-on: https://gerrit.libreoffice.org/c/core/+/209087 Tested-by: Jenkins Reviewed-by: Neil Roberts <nroberts@libreoffice.org>