suricatasc: update python packaging

suricatasc: update python packaging

'make install' install now suricatasc script and Python module to
the system. The suricatasc client module can now be used in other
Python projects by using 'import suricatasc'.

A transformation was needed for distribution of a module and a script.
Module in src directory is now containing most of the code and the
script only handle argument parsing and the creation of a unix socket
client through 'suricatasc' module.