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_vpl.py b/test/py/tests/test_vpl.py
index 8c472ca..735e2c3 100644
--- a/test/py/tests/test_vpl.py
+++ b/test/py/tests/test_vpl.py
@@ -5,7 +5,7 @@
 import os.path
 import pytest
 
-def test_vpl(u_boot_console, ut_vpl_subtest):
+def test_vpl(ubman, ut_vpl_subtest):
     """Execute a "ut" subtest.
 
     The subtests are collected in function generate_ut_subtest() from linker
@@ -19,11 +19,11 @@
     implemented in C function foo_test_bar().
 
     Args:
-        u_boot_console (ConsoleBase): U-Boot console
+        ubman (ConsoleBase): U-Boot console
         ut_subtest (str): VPL test to be executed (e.g. 'dm platdata_phandle')
     """
     try:
-        cons = u_boot_console
+        cons = ubman
         cons.restart_uboot_with_flags(['-u', '-k', ut_vpl_subtest.split()[1]])
         output = cons.get_spawn_output().replace('\r', '')
         assert 'failures: 0' in output
@@ -31,4 +31,4 @@
         # Restart afterward in case a non-VPL test is run next. This should not
         # happen since VPL tests are run in their own invocation of test.py, but
         # the cost of doing this is not too great at present.
-        u_boot_console.restart_uboot()
+        ubman.restart_uboot()