ldapmod.py/ldap3.py: Force modlist for search/modify/etc. to be str types

[terminalmage]

This is done by adding a to_str argument to our decode helpers which allows you to force the string/bytestring to be converted to a str type, and then using that new functionality in ldapmod.py/ldap3.py.

Resolves #46859.
Resolves #46887.

[angeloudy]

Even with to_str=False, the decode function will call _decode_func = salt.utils.stringutils.to_unicode, which will still return str

def to_unicode(s, encoding=None, errors='strict', normalize=False):
    '''
    Given str or unicode, return unicode (str for python 3)
    '''
    def _normalize(s):
        return unicodedata.normalize('NFC', s) if normalize else s

    if six.PY3:
        if isinstance(s, str):
            return _normalize(s)
        elif isinstance(s, (bytes, bytearray)):
            return _normalize(to_str(s, encoding, errors))
        raise TypeError('expected str, bytes, or bytearray')
    else:
        # This needs to be str and not six.string_types, since if the string is
        # already a unicode type, it does not need to be decoded (and doing so