test: Add a section for closing the connection

This can take a while and involve multiple steps (e.g. turning the board
back off). Add a section for it and show the output.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Tom Rini <trini@konsulko.com>
diff --git a/test/py/u_boot_console_base.py b/test/py/u_boot_console_base.py
index 42c81b2..fa9cd57 100644
--- a/test/py/u_boot_console_base.py
+++ b/test/py/u_boot_console_base.py
@@ -183,7 +183,10 @@
         """
 
         if self.p:
-            self.p.close()
+            self.log.start_section('Stopping U-Boot')
+            close_type = self.p.close()
+            self.log.info(f'Close type: {close_type}')
+            self.log.end_section('Stopping U-Boot')
         self.logstream.close()
 
     def set_lab_mode(self):