test/py: Manual python3 fixes

- Modern pytest is more visible in telling us about parameters that we
  had not described, so describe a few more.
- ConfigParser.readfp(...) is now configparser.read_file(...)
- As part of the "strings vs bytes" conversions in Python 3, we use the
  default encoding/decoding of utf-8 but in some places tell Python to
  replace problematic conversions rather than throw a fatal error.
- Fix a typo noticed while doing the above ("tot he" -> "to the").
- As suggested by Stephen, re-alphabetize the import list
- Per Heinrich, replace how we write contents in test_fit.py

Reviewed-by: Simon Glass <sjg@chromium.org>
Tested-by: Stephen Warren <swarren@nvidia.com>
Tested-by: Simon Glass <sjg@chromium.org> [on sandbox]
Signed-off-by: Tom Rini <trini@konsulko.com>

test/py/conftest.py

@@ -13,17 +13,16 @@
 # - Implementing custom pytest markers.
 
 import atexit
+import configparser
 import errno
+import io
 import os
 import os.path
 import pytest
-from _pytest.runner import runtestprotocol
 import re
-import io
+from _pytest.runner import runtestprotocol
 import sys
 
-import configparser
-
 # Globals: The HTML log file, and the connection to the U-Boot console.
 log = None
 console = None
@@ -168,7 +167,7 @@ def pytest_configure(config):
             ini_str = '[root]\n' + f.read()
             ini_sio = io.StringIO(ini_str)
             parser = configparser.RawConfigParser()
-            parser.readfp(ini_sio)
+            parser.read_file(ini_sio)
             ubconfig.buildconfig.update(parser.items('root'))
 
     ubconfig.test_py_dir = test_py_dir