Fix compilation error with Ubuntu 16.10
Fix compilation error with Ubuntu 16.10

Change-Id: I4a92beb2128991d6eb641012770d9692776ecd7b
Signed-off-by: Tom Flynn <abc7c57a6537c493534eb3847500f37bef7b716d@gmail.com>

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