add explicit dependency on pyopenssl

The library is used in glanceclient/common/https.py and the
documentation build for the API fails without the dependency.

Update the error handling so that when OpenSSL reports an error it is
converted to a client communication error.

Change-Id: I0c0fb3139bb848d0cbaf88ae6a767a730bea74eb
Signed-off-by: Doug Hellmann <doug@doughellmann.com>

glanceclient/common/http.py

@@ -19,6 +19,7 @@ import socket
 
 from keystoneauth1 import adapter
 from keystoneauth1 import exceptions as ksa_exc
+import OpenSSL
 from oslo_utils import importutils
 from oslo_utils import netutils
 import requests
@@ -267,6 +268,10 @@ class HTTPClient(_BaseHTTPClient):
             message = ("Error communicating with %(endpoint)s %(e)s" %
                        {'endpoint': endpoint, 'e': e})
             raise exc.CommunicationError(message=message)
+        except OpenSSL.SSL.Error as e:
+            message = ("SSL Error communicating with %(url)s: %(e)s" %
+                       {'url': conn_url, 'e': e})
+            raise exc.CommunicationError(message=message)
 
         # log request-id for each api call
         request_id = resp.headers.get('x-openstack-request-id')

requirements.txt

@@ -11,3 +11,4 @@ six>=1.9.0 # MIT
 oslo.utils>=3.20.0 # Apache-2.0
 oslo.i18n!=3.15.2,>=2.1.0 # Apache-2.0
 wrapt>=1.7.0 # BSD License
+pyOpenSSL>=0.14  # Apache-2.0