Added method get_order_states_to_import to get importable order states
Added method get_order_states_to_import to get importable order states

tarunbhardwaj/trytond-sale-channel,fulfilio/trytond-sale-channel,prakashpp/trytond-sale-channel,sharoonthomas/trytond-sale-channel,priyankarani/trytond-sale-channel