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.
{header}
<title>Mercurial repository not found</title>
</head>
<body>
<h2>Mercurial repository not found</h2>
The specified repository "{repo|escape}" is unknown, sorry.
Please go back to the <a href="{url|urlescape}">main repository list page</a>.
{footer}