Revert "Fix XNI TCP EOF logic" (#18)

This reverts commit 028ba7c78a35960f51151dbaae9f437b76b1a438.
Revert "Hack EOF logic for end-to-end transfers" (#18)

This reverts commit d5055a46c708122e40198e3f8fcd514a85b43a41.
Revert "Always send EOF message when using XNI (#18)"

This reverts commit b6b208577e4c14355e65bdb1741d1fe0a02a785a.