Fix for Bug 396: https://bugs.opendaylight.org/show_bug.cgi?id=396

Use a new buffer (and subsequently free) for each new outgoing message
from the DCS Server. 

Change-Id: I8c3c3302d5671b9142ef1d60b1e2b94cf9d1003f
Signed-off-by: Amitabha Biswas <abiswas@us.ibm.com>