{BTS,PCU}_Tests: bump default PCUIF version: 9 -> 10

Both osmo-bts and osmo-pcu are switching to PCUIFv10 soon, so let's
use the new version by default.  For older (latest) IUT versions
not supporting PCUIFv10, one would need to override this module
parameter in {BTS,PCU}_Tests.cfg.

Change-Id: I9350c4a54434c3d46ce9424f382ca0057e58d053
Related: SYS#4868, SYS#4915
3 files changed