Test error case for ipv4_network
Check --help option for hakapcap
Catch error when the network address is incorrect

Return a network structure set to zero when the
network address is incorrect
Check a bad network
Fix segfault when playing ipv4 unit tests

Problem solved by adding a property to
TestUnit.cmake file
Merge branch 'feature/network_test' into develop

* feature/network_test:
  Fix segfault when playing ipv4 unit tests
  Check a bad network
  Catch error when the network address is incorrect
  Check --help option for hakapcap
  Test error case for ipv4_network