CRM-11160 - Set CURLOPT_SSL_VERIFYHOST based the system's general "verifySSL" option

We currently set Curl's VERIFYPEER option based on the CiviCRM setting, "verifySSL." This patch carries that forward to also set the VERIFYHOST option.

Per email discussion, it would be great if @deepak-srivastava and @eileenmcnaughton could test a couple of the payment processors that are affected by this.

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* CRM-11160:
  http://issues.civicrm.org/jira/browse/CRM-11160