Update comment on v1model.p4 checksum_error field to match simple_switch
Update comment on v1model.p4 checksum_error field to match simple_switch

This i a recent update to simple_switch behavior.

mbudiu-vmw/p4c-clone,p4lang/p4c,p4lang/p4c,hanw/p4c,p4lang/p4c,mbudiu-vmw/p4c-clone,p4lang/p4c,p4lang/p4c,hanw/p4c,mbudiu-vmw/p4c-clone,hanw/p4c,hanw/p4c,mbudiu-vmw/p4c-clone