Fix "SyntaxWarning: invalid escape sequence" in onion-grater

onion-grater[4785]: /usr/local/lib/onion-grater:723: SyntaxWarning: invalid escape sequence '\s'
onion-grater[4785]:   setconf_reset_part = "\s*|\s*".join([
onion-grater[4785]: /usr/local/lib/onion-grater:727: SyntaxWarning: invalid escape sequence '\s'
onion-grater[4785]:   setconf_assignment_part = "\s*|\s*".join([
onion-grater[4785]: /usr/local/lib/onion-grater:738: SyntaxWarning: invalid escape sequence '\s'
onion-grater[4785]:   'pattern': "({})+".format("\s*|\s*".join(setconf_parts))

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