[gnutls-devel] GnuTLS | ktls: Do not return GNUTLS_E_INTERRUPTED/AGAIN from short writes (!1723)

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Alexander Sosedkin commented: https://gitlab.com/gnutls/gnutls/-/merge_requests/1723#note_1364872945

I see the following pattern in our examples (copy-pasted from doc/examples/ex-client-anon.c):
```c
#define LOOP_CHECK(rval, cmd) \
        do { \
                rval = cmd; \
        } while(rval == GNUTLS_E_AGAIN || rval == GNUTLS_E_INTERRUPTED); \
        assert(rval >= 0)
...
LOOP_CHECK(ret, gnutls_record_send(session, MSG, strlen(MSG)));
```

Do I understand correctly that

1. as short writes used to return GNUTLS_E_INTERRUPTED/AGAIN even if something is written, our examples used to be incorrect when KTLS is used because they over-sent on interruption?
2. as short writes started suppressing GNUTLS_E_INTERRUPTED/AGAIN and reporting a partial write, our examples became uniformly incorrect with and without KTLS, because now they're going to under-send on interruption?

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