Add some missing includes to harness.h

Signed-off-by: Casey Dahlin <casey.dahlin@gmail.com>
Fix some signedness-agreement problems in tests

Signed-off-by: Casey Dahlin <casey.dahlin@gmail.com>
Remove some unused flag variables from test harness

Signed-off-by: Casey Dahlin <casey.dahlin@gmail.com>
Remove unused variable from ns_test

Signed-off-by: Casey Dahlin <casey.dahlin@gmail.com>