ofproto-dpif: Move recirc members from struct xlate_out to struct xlate_ctx

There does not seem to be a reason to expose
recirc members in struct xlate_out to move them
to struct xlate_ctx.

Signed-off-by: Simon Horman <horms@verge.net.au>
Signed-off-by: Ben Pfaff <blp@nicira.com>