test: Move stat-printing into its own function

Add a function to show the stats, so we can decide when to print it.

This slightly adjusts the output, so that any 'test not found' message
appears on its own line after all other output.

The 'failures' message now appears in lower case so update pytest
accordingly.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/test/py/tests/test_spl.py b/test/py/tests/test_spl.py
index 42e4c43..474f430 100644
--- a/test/py/tests/test_spl.py
+++ b/test/py/tests/test_spl.py
@@ -36,7 +36,7 @@
         cons = u_boot_console
         cons.restart_uboot_with_flags(['-u', '-k', ut_spl_subtest.split()[1]])
         output = cons.get_spawn_output().replace('\r', '')
-        assert 'Failures: 0' in output
+        assert 'failures: 0' in output
     finally:
         # Restart afterward in case a non-SPL test is run next. This should not
         # happen since SPL tests are run in their own invocation of test.py, but
diff --git a/test/py/tests/test_upl.py b/test/py/tests/test_upl.py
index 3164bda..d94359d 100644
--- a/test/py/tests/test_upl.py
+++ b/test/py/tests/test_upl.py
@@ -35,4 +35,4 @@
 
     # Check the FIT offsets look correct
     output = cons.run_command('ut upl -f upl_test_info_norun')
-    assert 'Failures: 0' in output
+    assert 'failures: 0' in output
diff --git a/test/py/tests/test_ut.py b/test/py/tests/test_ut.py
index cacf11f..d2d8ce1 100644
--- a/test/py/tests/test_ut.py
+++ b/test/py/tests/test_ut.py
@@ -607,4 +607,4 @@
         assert 'Unknown command \'quux\' - try \'help\'' in output
     else:
         output = u_boot_console.run_command('ut ' + ut_subtest)
-    assert output.endswith('Failures: 0')
+    assert output.endswith('failures: 0')
diff --git a/test/py/tests/test_vbe.py b/test/py/tests/test_vbe.py
index 50b6c1c..861df3f 100644
--- a/test/py/tests/test_vbe.py
+++ b/test/py/tests/test_vbe.py
@@ -117,4 +117,4 @@
     with cons.log.section('Kernel load'):
         output = cons.run_command_list(cmd.splitlines())
 
-    assert 'Failures: 0' in output[-1]
+    assert 'failures: 0' in output[-1]
diff --git a/test/py/tests/test_vpl.py b/test/py/tests/test_vpl.py
index 4af578b..8c472ca 100644
--- a/test/py/tests/test_vpl.py
+++ b/test/py/tests/test_vpl.py
@@ -26,7 +26,7 @@
         cons = u_boot_console
         cons.restart_uboot_with_flags(['-u', '-k', ut_vpl_subtest.split()[1]])
         output = cons.get_spawn_output().replace('\r', '')
-        assert 'Failures: 0' in output
+        assert 'failures: 0' in output
     finally:
         # 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