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/

test/py/tests/test_unknown_cmd.py

@@ -2,12 +2,12 @@
 # Copyright (c) 2015 Stephen Warren
 # Copyright (c) 2016, NVIDIA CORPORATION. All rights reserved.
 
-def test_unknown_command(u_boot_console):
+def test_unknown_command(ubman):
     """Test that executing an unknown command causes U-Boot to print an
     error."""
 
     # The "unknown command" error is actively expected here,
     # so error detection for it is disabled.
-    with u_boot_console.disable_check('unknown_command'):
-        response = u_boot_console.run_command('non_existent_cmd')
+    with ubman.disable_check('unknown_command'):
+        response = ubman.run_command('non_existent_cmd')
     assert('Unknown command \'non_existent_cmd\' - try \'help\'' in response)