(#6820) Fix Invalid multibyte character

puppet/spec/unit/network/authstore_spec.rb:89:
invalid multibyte char (US-ASCII)
puppet/spec/unit/network/authstore_spec.rb:89:
syntax error, unexpected $end, expecting ']'

" 2001:0000:1234:0000:0000:C1C0:ABCD:0876  0",
                                               ^

There was a non-breaking space (HEX A0) in that line because according
to Markus (who made the original commit), these test lines were copy
pasted from a web page. The intent wasn't to test non-breaking speace
chacters for IPV6.

Reviewed-by: Jacob Helwig <jacob@puppetlabs.com>