sslutil: change comment and logged message for found ca cert file
Future patches will change _defaultcacerts() to do something
on platforms that aren't OS X. Change the comment and logged
message to reflect the future.
<table class="slogEntry parity{parity}">
<tr>
<td class="age">{date|rfc822date}</td>
<td class="author">{author|person}</td>
<td class="node"><a href="{url|urlescape}rev/{node|short}{sessionvars%urlparameter}">{desc|strip|firstline|escape|nonempty}</a></td>
</tr>
</table>