Move entry->blob creation out of write stage (#1257)

- The write stage will output vector of entries
- Broadcast stage will create blobs out of the entries
- Helps reduce MIPS requirements for write stage

src/fullnode.rs

@@ -243,7 +243,7 @@ impl Fullnode {
                 // TODO: To light up PoH, uncomment the following line:
                 //let tick_duration = Some(Duration::from_millis(1000));
 
-                let (tpu, blob_receiver) = Tpu::new(
+                let (tpu, entry_receiver) = Tpu::new(
                     keypair,
                     &bank,
                     &crdt,
@@ -262,7 +262,7 @@ impl Fullnode {
                     shared_window,
                     entry_height,
                     blob_recycler.clone(),
-                    blob_receiver,
+                    entry_receiver,
                 );
                 thread_hdls.extend(broadcast_stage.thread_hdls());
             }