fix cppcheck errors
link lib_ettercap against etterlog and etterfilter

Conflicts:
	utils/CMakeLists.txt
Removed useless files already in libettercap, useless links already linked against libettercap and moved getopt and inet_aton to libettercap rather than utils only
Merge branch 'libettercap-link' of github.com:LocutusOfBorg/ettercap into libettercap-link

Conflicts:
	utils/CMakeLists.txt
Merge pull request #464 from koeppea/fix-cppcheck-errors

fix cppcheck errors
Merge pull request #506 from LocutusOfBorg/libettercap-link

link etterlog and etterfilter against lib_ettercap