Address last TSAN issue exposed by libopflex unit tests
Address last TSAN issue exposed by libopflex unit tests

Signed-off-by: Tom Flynn <abc7c57a6537c493534eb3847500f37bef7b716d@gmail.com>
Change-Id: I95b54bbf6f9a30dd216c9bd25ba3d30f93ee1a3c

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