pysim/log: also accept ANSI strings to specify the log message colors

the PySimLogger class currently only accepts cmd2 color enum values.
This is what we need for pySim-shell.py. However, in case we want to
use the PySimLogger in stand-alone programs that do not use cmd2, this
is a bit bulky. Let's add some flexibility to PySimLogger, so that we
can specify the colors as raw ANSI strings as well.

Change-Id: I93543e19649064043ae8323f82ecd8c423d1d921
Related: SYS#7725

pySim/log.py

@@ -108,7 +108,10 @@ class PySimLogger:
                 formatted_message = logging.Formatter.format(PySimLogger.__formatter, record)
             color = PySimLogger.colors.get(record.levelno)
             if color:
-                PySimLogger.print_callback(style(formatted_message, fg = color))
+                if isinstance(color, str):
+                    PySimLogger.print_callback(color + formatted_message + "\033[0m")
+                else:
+                    PySimLogger.print_callback(style(formatted_message, fg = color))
             else:
                 PySimLogger.print_callback(formatted_message)