SSL partial write is not fully correct

[ghost]

It does not send as far as possible, but returns if successful.

Either switch back to SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER or make us_ssl_socket_write call SSL_write in a loop.

v0.0.5

[ghost]

Tests need paritial write mode to pass, since the tests do not guarantee to call write with same content. Tests should be fixed, or we should swap to parital write and have it fixed.

[ghost]

We do use SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER currently, and tests pass. This is not exactly correct usage of SSL for the test being (the test should guarantee sending the same content again) but since it works, and it is only a test, it's fine.