net: UDP socket gets local_addr, read_fixed and write_fixed #189
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The type UdpSocket gets methods local_addr, read_fixed and write_fixed.
local_addr is useful when binding the socket to 127.0.0.1:0 to be able to report what port the OS assigned.
The read_fixed and write_fixed are useful, like read and write, when the UDP socket has been connected to an address.