Convinient method for POST requests
        Returns http request status value from a POST request

def _do_post(self, url, **kwargs):
        """
        Convinient method for POST requests
        Returns http request status value from a POST request
        """
        #TODO:
        # Add error handling. Check for HTTP status here would be much more conveinent than in each calling method
        scaleioapi_post_headers = {'Content-type':'application/json','Version':'1.0'}
        self.logger.debug("_do_post()")

        if kwargs:
            for key, value in kwargs.iteritems():
                if key == 'headers':
                    scaleio_post_headers = value
                    print "Adding custom POST headers"
                if key == 'files':
                    upl_files = value
                    print "Adding files to upload"
        try:
            response = self._session.post(url, headers=scaleioapi_post_headers, verify_ssl=self._im_verify_ssl, files=upl_files)
            self.logger.debug("_do_post() - Response: " + "{}".format(response.text))
            if response.status_code == requests.codes.ok:
                return response
            else:
                self.logger.error("_do_post() - Response Code: " + "{}".format(response.status_code))
                raise RuntimeError("_do_post() - HTTP response error" + response.status_code)
        except:
            raise RuntimeError("_do_post() - Communication error with ScaleIO gateway")
        return response