Added group structure.

Extracted 1:n NAT64 mapping for re-usage.
Refined UT handling.

Introduced map param for Ipv4Port, so the test adaptation will provide only messages addressed to this address.

Added first version of TC_NAT64_LSN_NP_BV_001.

Minor changes for DSlite.

Update client number in f_serverSyncNClientsAndStop function call

Finalise TC_DSLITE_B4_BF_BV_001
Start implementation of TC_DSLITE_AFTR_BF_BV_001

Add IPv4Packets templates

Further adaptation.

Added template for TC_DSLITE_B4_FRAG_BV_002.