OVSDriver: set kflow->num_stats_ptrs on invalidate
OVSDriver: set kflow->num_stats_ptrs on invalidate

vezril/ivs,harshsin/ivs,harshsin/ivs,harshsin/ivs,harshsin/ivs,floodlight/ivs,floodlight/ivs,floodlight/ivs,vezril/ivs,vezril/ivs