There are many possible ways that a flow can be invalid so we've
added logging for most of them. This adds logs for the remaining
possible cases so there isn't any ambiguity while debugging.

CC: Federico Iezzi <fiezzi@enter.it>
Signed-off-by: NJesse Gross <jesse@nicira.com>
Acked-by: NThomas Graf <tgraf@noironetworks.com>
Signed-off-by: NPravin B Shelar <pshelar@nicira.com>