Changes

pySim-prog: generate Ki and OPc value using _digits() function

The _digits() function is used in the context of auto generating the
card individual data using a random seed (--secret) and a card number.
(--num). Unfortunately the Ki and the OPc value are not covered by
this mechanism, which means that even when the card number and the
random seed remain static, the Ki and the OPc value are always
changing.

Related: SYS#4120
Change-Id: Ib53d9d04a2073dafcca7cd21b0324bee5a23c540