Add name annotation to NoAction in core.p4
Add name annotation to NoAction in core.p4

To avoid ending up with NoAction_<x> names for NoAction clones in the
IR and eventually in the p4runtime data.

Addresses #309 partially at least.

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