[SysApps] Add the IDL file for RawSockets UDP

IDL file will generate the serialization code for the IPC messages.
[SysApps] Add the Javascript shim for UDP sockets

This is the old version of the API, should do it until the
new one gets ready.
[SysApps] Implement the UDP socket native backend

Only Multicast support is not implemented yet.
[SysApps] Added browsertests for the UDP API
Merge pull request #1728 from tmpsantos/raw_socket

[SysApps] Add UDP sockets support