fix timezone may change after reboot

in some distros, the timezone may change after rebooting, so current
boot time is smaller than last time. Comparing with equal to avoid
timeout.

lisa/tools/reboot.py

@@ -64,7 +64,7 @@ class Reboot(Tool):
 
         connected: bool = False
         while (
-            last_boot_time >= current_boot_time and timer.elapsed(False) < self.time_out
+            last_boot_time == current_boot_time and timer.elapsed(False) < self.time_out
         ):
             try:
                 self.node.close()