test/py: Shorten u_boot_console

This fixture name is quite long and results in lots of verbose code.
We know this is U-Boot so the 'u_boot_' part is not necessary.

But it is also a bit of a misnomer, since it provides access to all the
information available to tests. It is not just the console.

It would be too confusing to use con as it would be confused with
config and it is probably too short.

So shorten it to 'ubman'.

Signed-off-by: Simon Glass <sjg@chromium.org>
Link: https://lore.kernel.org/u-boot/CAFLszTgPa4aT_J9h9pqeTtLCVn4x2JvLWRcWRD8NaN3uoSAtyA@mail.gmail.com/
diff --git a/test/py/tests/test_button.py b/test/py/tests/test_button.py
index 3b7f148..f0d85be 100644
--- a/test/py/tests/test_button.py
+++ b/test/py/tests/test_button.py
@@ -4,10 +4,10 @@
 
 @pytest.mark.boardspec('sandbox')
 @pytest.mark.buildconfigspec('cmd_button')
-def test_button_list(u_boot_console):
+def test_button_list(ubman):
     """Test listing buttons"""
 
-    response = u_boot_console.run_command('button list; echo rc:$?')
+    response = ubman.run_command('button list; echo rc:$?')
     assert('button1' in response)
     assert('button2' in response)
     assert('rc:0' in response)
@@ -15,23 +15,23 @@
 @pytest.mark.boardspec('sandbox')
 @pytest.mark.buildconfigspec('cmd_button')
 @pytest.mark.buildconfigspec('cmd_gpio')
-def test_button_return_code(u_boot_console):
+def test_button_return_code(ubman):
     """Test correct reporting of the button status
 
     The sandbox gpio driver reports the last output value as input value.
     We can use this in our test to emulate different input statuses.
     """
 
-    u_boot_console.run_command('gpio set a3; gpio input a3');
-    response = u_boot_console.run_command('button button1; echo rc:$?')
+    ubman.run_command('gpio set a3; gpio input a3');
+    response = ubman.run_command('button button1; echo rc:$?')
     assert('on' in response)
     assert('rc:0' in response)
 
-    u_boot_console.run_command('gpio clear a3; gpio input a3');
-    response = u_boot_console.run_command('button button1; echo rc:$?')
+    ubman.run_command('gpio clear a3; gpio input a3');
+    response = ubman.run_command('button button1; echo rc:$?')
     assert('off' in response)
     assert('rc:1' in response)
 
-    response = u_boot_console.run_command('button nonexistent-button; echo rc:$?')
+    response = ubman.run_command('button nonexistent-button; echo rc:$?')
     assert('not found' in response)
     assert('rc:1' in response)