Inline some variables

this doesn't matter a ton but when grepping for where this stuff
changed, it was nice to see that this was always assigned to UTC::new. i
may revert this before merge.

Author: steveklabnik

src/sled_agent/sled_agent.rs

@@ -1059,14 +1059,13 @@ mod test {
         logctx: &LogContext,
         initial_state: ApiInstanceState,
     ) -> (SimObject<SimInstance>, Receiver<()>) {
-        let now = Utc::now();
         let initial_runtime = {
             ApiInstanceRuntimeState {
                 run_state: initial_state,
                 reboot_in_progress: false,
                 sled_uuid: uuid::Uuid::new_v4(),
                 gen: 1,
-                time_updated: now,
+                time_updated: Utc::now(),
             }
         };
 
@@ -1077,12 +1076,11 @@ mod test {
         logctx: &LogContext,
         initial_state: ApiDiskState,
     ) -> (SimObject<SimDisk>, Receiver<()>) {
-        let now = Utc::now();
         let initial_runtime = {
             ApiDiskRuntimeState {
                 disk_state: initial_state,
                 gen: 1,
-                time_updated: now,
+                time_updated: Utc::now(),
             }
         };