Vasil Dimov 42c779f503 net: extend Sock with methods for robust send & read until terminator ...

Introduce two high level, convenience methods in the `Sock` class:

* `SendComplete()`: keep trying to send the specified data until either
  successfully sent all of it, timeout or interrupted.

* `RecvUntilTerminator()`: read until a terminator is encountered (never
  after it), timeout or interrupted.

These will be convenient in the I2P SAM implementation.

`SendComplete()` can also be used in the SOCKS5 implementation instead
of calling `send()` directly.

2021-03-01 17:36:16 +01:00

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