import_data: Add separator option and mandatory field control.

(ActionItem2745)

Signed-off-by: Gabriela Navarro <navarro1703@gmail.com>
Signed-off-by: Marcos Ramos <ms.ramos@outlook.com>
Signed-off-by: Fabio Teixeira <fabio1079@gmail.com>
Signed-off-by: David Carlos <ddavidcarlos1392@gmail.com>