[inventory] Add display implementation for NTP timesync

Author: smklein

nexus/types/src/inventory/display.rs

@@ -734,6 +734,24 @@ fn display_sleds(
                         }
                     }
                 }
+
+                let timesync = zones
+                    .keys()
+                    .find_map(|zone_id| collection.ntp_timesync.get(zone_id));
+
+                match timesync {
+                    None => writeln!(
+                        indent2,
+                        "No information from NTP for this sled"
+                    )?,
+                    Some(ts) if ts.synced => {
+                        writeln!(indent2, "NTP reports that time is synced")?
+                    }
+                    Some(_) => writeln!(
+                        indent2,
+                        "NTP reports that time is NOT synced"
+                    )?,
+                }
             }
         }