lseek was triggering a number overflow by converting long to integer on
its return value

Added specific lseek test

 - Use regular expression to parse lines
 - More consistent error handling
 - More comprehensive error messages

We now use getaddrinfo syscall instead of parsing /etc/hosts in order to
resolve hostnames

RPC port can now be configured at runtime through `--bind-port` command line argument.

For some comunication layers an out of band communication is required for putting in place the specific protocol handshake.

In those case a shared lookup file could be used to distribute deamon's endpoints information to all the clients.

This file need to resides on a shared filesystem and can be specified using the new CLI parameter `--lookup-file`.