Generalize process_entries()

And use it in fullnode

src/bank.rs

@@ -260,7 +260,10 @@ impl Bank {
             .collect()
     }
 
-    pub fn process_entries(&self, entries: Vec<Entry>) -> Result<()> {
+    pub fn process_entries<I>(&self, entries: I) -> Result<()>
+    where
+        I: IntoIterator<Item = Entry>,
+    {
         for entry in entries {
             self.register_entry_id(&entry.id);
             for result in self.process_transactions(entry.transactions) {

src/bin/fullnode.rs

@@ -114,17 +114,7 @@ fn main() {
     bank.register_entry_id(&entry1.id);
 
     eprintln!("processing entries...");
-
-    for entry in entries {
-        let results = bank.process_transactions(entry.transactions);
-        for result in results {
-            if let Err(e) = result {
-                eprintln!("failed to process transaction {:?}", e);
-                exit(1);
-            }
-        }
-        bank.register_entry_id(&entry.id);
-    }
+    bank.process_entries(entries).expect("process_entries");
 
     eprintln!("creating networking stack...");