Changes value of CURLOPT_SSL_VERIFYHOST set in Http Client

1 as a value for CURLOPT_SSL_VERIFYHOST is deprecated
in libcurl 7.28.1, recommended value is now 2

Latest PHP stables (5.3.21 and 5.4.11) will trigger a notice if 1 is attempted to be set as the value of CURLOPT_SSL_VERIFYHOST. See https://bugs.php.net/bug.php?id=63795