PacketSniffer: Incomplete trace in case of a SIGTERM

[FaHaGit]

Environment:
everest-core:
3e5c467

Test Sequence:

• Start a trace
• Restart everest while a high-level communication session is running

Expected Behavior:
In case of a SIGTERM the modul should stop recording immediately and write the pcap file completely. There should be no error message in the log of EVerest.

Observed Behavior:

Currently the traces are incomplete in case of a unexpected EVerest restart trough a SIGTERM. This is quite annoying when trying to analyze an unexpected restart of EVerest

Additional note:

Furthermore, an error message seems to appear in the log after every v2g charging session

Feb 01 10:03:11 tarragon manager[2951]: 2024-02-01 10:03:11.640330 [ERRO] packet_sniffer: void module::PacketSniffer::capture(const string&, const string&) :: Error reading packets from interface: eth1, error: