fix signedness bug in SSL transport
fix signedness bug in SSL transport

Change-Id: I7749c6e6fb31959e14cd3fd62c2b80258e274607
Signed-off-by: Alessandro Salvatori <8a0c874bf01335702b42d6983c4d9b3eb550c634@gmail.com>

mhrobinson/opflex,opendaylight/opflex,opendaylight/opflex,mhrobinson/opflex,mhrobinson/opflex,mhrobinson/opflex,opendaylight/opflex,opendaylight/opflex