PCU_Tests_NS: allow an UNBLOCK message to arrive before ALIVE

The ALIVE PDU does not have to be sent before an UNBLOCK message.
Ignore UNBLOCK messages in cases a single ALIVE is expected.

According to TS 48.016 v5.2.0, 7.4:
"Upon successful completion of an NS-VC reset procedure,
a BSS (or SGSN) shall start timer Tns-test, then [..]"
The ALIVE should arive Tns-test after the reset procedure (typ. 1s-60s).

Change-Id: I11d77b7477981998082967e5123b61636af2b980
1 file changed