- Make I2PSocketFull.close() nonblocking; it will now cause any user-side
     writes blocked in I/O (Connection.packetSendChoke()) to throw
     an exception (tickets #629, #1041)
   - Don't ignore InterruptedExceptions; throw InterruptedIOException
   - Back out static disconnect exception
   - MessageInputStream locking fixes
   - Cleanups
 I2PSnark:
   - Close socket before closing output stream to avoid blocking in
     Peer.disconnect(), and prevent Peer.disconnect() loop