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_md.py b/test/py/tests/test_md.py
index 83e3c54..69e12eb 100644
--- a/test/py/tests/test_md.py
+++ b/test/py/tests/test_md.py
@@ -6,31 +6,31 @@
 import u_boot_utils
 
 @pytest.mark.buildconfigspec('cmd_memory')
-def test_md(u_boot_console):
+def test_md(ubman):
     """Test that md reads memory as expected, and that memory can be modified
     using the mw command."""
 
-    ram_base = u_boot_utils.find_ram_base(u_boot_console)
+    ram_base = u_boot_utils.find_ram_base(ubman)
     addr = '%08x' % ram_base
     val = 'a5f09876'
     expected_response = addr + ': ' + val
-    u_boot_console.run_command('mw ' + addr + ' 0 10')
-    response = u_boot_console.run_command('md ' + addr + ' 10')
+    ubman.run_command('mw ' + addr + ' 0 10')
+    response = ubman.run_command('md ' + addr + ' 10')
     assert(not (expected_response in response))
-    u_boot_console.run_command('mw ' + addr + ' ' + val)
-    response = u_boot_console.run_command('md ' + addr + ' 10')
+    ubman.run_command('mw ' + addr + ' ' + val)
+    response = ubman.run_command('md ' + addr + ' 10')
     assert(expected_response in response)
 
 @pytest.mark.buildconfigspec('cmd_memory')
-def test_md_repeat(u_boot_console):
+def test_md_repeat(ubman):
     """Test command repeat (via executing an empty command) operates correctly
     for "md"; the command must repeat and dump an incrementing address."""
 
-    ram_base = u_boot_utils.find_ram_base(u_boot_console)
+    ram_base = u_boot_utils.find_ram_base(ubman)
     addr_base = '%08x' % ram_base
     words = 0x10
     addr_repeat = '%08x' % (ram_base + (words * 4))
-    u_boot_console.run_command('md %s %x' % (addr_base, words))
-    response = u_boot_console.run_command('')
+    ubman.run_command('md %s %x' % (addr_base, words))
+    response = ubman.run_command('')
     expected_response = addr_repeat + ': '
     assert(expected_response in response)