Changes

ttcn3-stp-test: rename mp_stp_has_asp_quirk

Rename the option to mp_osmo_stp_newer_than_1_4_0, because I'm going to
use the variable in an upcoming osmo-ttcn3-hacks.git patch for something
unrelated to the asp quirk so we can avoid introducing another variable.

Related: osmo-ttcn3-hacks I43b1aa2c029c88c88320d40f60df46a5eb6c4c24
Related: OS#4239
Change-Id: I6a32398242b53c827a94cf65e4a35900a7c4171a