Allocating a pseudo-TTY (-t, --tty) fails when 'run' is executed
inside of a Jenkins or cron script. This change fixes
ttcn3-bts-test, which invokes 'run' to fetch the config files.
Change-Id: If22f682be4f004c5bb43e65098079a4f4fe6158d
Fixes: If15461240f3037c142c176fc7da745a1701ae3f8
The purpose is to run osmo-ttcn3-hacks/bsc/BSC_Tests_VAMOS.ttcn with
osmo-bts-omldummy -f VAMOS
(send BTS_FEAT_VAMOS = true).
Change-Id: I2146388bf683cfba99cef5592b8b141c3a6eabb1