Description:
------------
It's impossible to connect to a sphinx search daemon using a 
unix socket (feature missing from pecl sphinx or maybe 
libsphinxclient?), but the pure PHP API accepts unix sockets: 
http://code.google.com/p/sphinxsearch/source/browse/trunk/api
/sphinxapi.php#500

Reproduce code:
---------------
$s = new SphinxClient;
$s->setServer('/tmp/searchd.sock');
$s->query("test");
print_r($s->getLastError());

Expected result:
----------------
""

Actual result:
--------------
"host name lookup failed (host=/tmp/searchd.sock, 
error=Connection timed out)"