Changes

ttcn3-bsc-test: sleep 1s before starting testsuite

Give OsmoBSC time to connect to OsmoSTP, so BSSMAP RESET from the
testsuite doesn't fail in OsmoSTP with:
  MTP-TRANSFER.req for DPC 187: no route!

Without this patch, it would fail every other time on my system when
only having one test enabled in BSC_Tests.cfg.

Change-Id: Ic7f80bdfe2fe58e93c2f2e3baa6d7645fcdc3062