- removed hostname property creation from socketappender
- added hostname property creation to socketnode13 (used by socketreceiver)
- made same change to xmlsocketnode (used by xmlsocketreceiver)

git-svn-id: https://svn.apache.org/repos/asf/logging/log4j/companions/receivers/trunk@569080 13f79535-47bb-0310-9956-ffa450edef68