Revert "Transform the command we pass to subprocess into a byte string in _low_level-exec_command"

This reverts commit 0c013f592a.

Going to do this in the connection plugin

lib/ansible/plugins/action/__init__.py

@@ -488,8 +488,7 @@ class ActionBase(with_metaclass(ABCMeta, object)):
             verbatim, then this won't work.  May have to use some sort of
             replacement strategy (python3 could use surrogateescape)
         '''
-        # We may need to revisit this later.
-        cmd = to_bytes(cmd, errors='strict')
+
         if executable is not None:
             cmd = executable + ' -c ' + cmd