Changed `splunklib/data.py` `load` function to convert text provided into a utf-8 string so that Python XML parser will not throw errors when processing utf-8 encoded responses.

…ncoded only for utf strings, so that Python XML parser will not throw errors when processing utf-8 encoded responses.

…or-unicode-characters

Fix XML responses to not throw errors for unicode characters in `splunklib/data.py` `load` function.