Changes

ttcn3-dia2gsup: Avoid retrieving unexisting talloc report

The OSMO_SUT_{HOST,PORT} envvars are used to trigger retrieving of
talloc reportes from the VTY port in osmo-ttcn3-hacks.git
ttcn3-tcpdump-stop.sh.
osmo_dia2gsup is an erland app and hence it makes no sense trying to
retrieve such information.

Change-Id: I6ee3fa83758e09898d1cd05bf15bc3428e2ffd11