client/server: pass back packed thread_options in add_job()

Now the client can see the parsed options. As it turns out,
we need to parse locally since the client and server can be
vastly different operating systems and architectures. Pass
back the options, allowing the client to change them before
starting the job.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
diff --git a/server.h b/server.h
index 299c7a0..f8ba81a 100644
--- a/server.h
+++ b/server.h
@@ -108,14 +108,7 @@
 };
 
 struct cmd_add_job_pdu {
-	uint8_t jobname[32];
-	uint8_t ioengine[32];
-	uint32_t iodepth;
-	uint32_t rw;
-	uint32_t min_bs[2];
-	uint32_t max_bs[2];
-	uint32_t numjobs;
-	uint32_t group_reporting;
+	struct thread_options_pack top;
 };
 
 struct cmd_text_pdu {