add proto definitions

proto/openconfig/enums/enums.proto

proto/openconfig/openconfig.pb.go

proto/openconfig/openconfig.proto

proto/openconfig/openconfig_acl/openconfig_acl.pb.go

proto/openconfig/openconfig_acl/openconfig_acl.proto

proto/openconfig/openconfig_bgp/openconfig_bgp.pb.go

proto/openconfig/openconfig_bgp/openconfig_bgp.proto

...nconfig/openconfig_interfaces/openconfig_interfaces.pb.go

...nconfig/openconfig_interfaces/openconfig_interfaces.proto

...g/openconfig_local_routing/openconfig_local_routing.pb.go

...g/openconfig_local_routing/openconfig_local_routing.proto

.../openconfig/openconfig_messages/openconfig_messages.pb.go

.../openconfig/openconfig_messages/openconfig_messages.proto

.../openconfig/openconfig_platform/openconfig_platform.pb.go

.../openconfig/openconfig_platform/openconfig_platform.proto

proto/openconfig/openconfig_rib_bgp/openconfig_rib_bgp.pb.go

proto/openconfig/openconfig_rib_bgp/openconfig_rib_bgp.proto

...openconfig_routing_policy/openconfig_routing_policy.pb.go

...openconfig_routing_policy/openconfig_routing_policy.proto

proto/openconfig/openconfig_system/openconfig_system.pb.go