HTTPClient: actually set a timeout for requests

The 'timeout' attribute was previously left unused.

Change-Id: If615c390302425fe5a646b4651ec6f56aa08fd22
Closes-Bug: #1822052

glanceclient/common/http.py

@@ -270,6 +270,7 @@ class HTTPClient(_BaseHTTPClient):
                                         conn_url,
                                         data=data,
                                         headers=headers,
+                                        timeout=self.timeout,
                                         **kwargs)
         except requests.exceptions.Timeout as e:
             message = ("Error communicating with %(url)s: %(e)s" %