support custom service options in protoc-gen-scala (#845)
support custom service options in protoc-gen-scala (#845)

protoc-gen-scala currently fails on services with has custom options like this:

```
--scala_out: java.lang.RuntimeException: Generated message class "com.google.protobuf.DescriptorProtos$ServiceOptions" missing method "getDeprecated".
```

Looks like that's because `make_reflect_config.sh` didn't exercise that class in the e2e protos.

Adding a custom service option in e2e/src/main/protobuf/service.proto for this.
scalapb/ScalaPB,scalapb/ScalaPB,scalapb/ScalaPB,scalapb/ScalaPB,trueaccord/ScalaPB