Minor changes for IPv4 functionality.
Introduced ARP.

Added Ipv4 specific implementations and modifications in ttcn3 variants, external function implementation, test adaptation, etc.

f_sndInformationalReqAndWaitForRsp added

TC_SEC_6468_01());
TC_SEC_6365_01());
TC_SEC_6393_01());
TC_SEC_6394_01())

AH and ESP modules removed and TCs integrated to AtsSec modules

Misc validation changes.

Corrected Delete Payload.
Misc validation changes.

Passive side for IKE_AUTH finished

Removed f_setAuthHeader().

Removed unused parameters in f_setExtensionHdr().
Minor bug fix in f_setExtensionHdr().

Removed useless commented code and some pieces of code that were redundant with f_setExtensionHdrs().