Currently both RpcReportsWorker and RpcWorker are launched with
the same process title("rpc worker"), and we can't distinguish one from
the other.
This changes the process title of RpcReportsWorker, so that we can
find the worker used by RpcReportsWorker, not by RpcWorker.
Change-Id: I610a00667762bbdd45bc72c5a865694b92cfd45a