ns: add test case TC_tx_blocked_foreign_nsvc

Check if a BLOCK PDU over a different/foreign connection is parsed.
* 2x initialize NSVC (RESET/UNBLOCK)
* TTCN  0-> NS: block (nsvci 1)
* TTCN  <-0 NS: block ack (nsvci 1)
* TTCN  1-> NS: unit data (nsvci 1)
* TTCN  <-1 NS: status (blocked)

Change-Id: I2b37a712bd70037b35b9deb8dab4a72d1e1d29fb
3 files changed