Fix client when using no ssl compression

Since the release of the 0.16.1 client, using the 'no ssl compression'
option, whether on the command line, or via the library -- Nova does this by
default -- a stack trace was generated.

Closes-bug: 1442664
Related-bug: 1357430

Change-Id: I2b8ddcb0a7ae3cfccdfc20d3ba476f3b4f4ec32d

glanceclient/common/https.py

@@ -22,8 +22,11 @@ from requests import adapters
 from requests import compat
 try:
     from requests.packages.urllib3 import connectionpool
+    from requests.packages.urllib3 import poolmanager
 except ImportError:
     from urllib3 import connectionpool
+    from urllib3 import poolmanager
+
 
 from oslo_utils import encodeutils
 import six
@@ -146,6 +149,10 @@ class HTTPSAdapter(adapters.HTTPAdapter):
     https pool by setting glanceclient's
     one.
     """
+    def __init__(self, *args, **kwargs):
+        classes_by_scheme = poolmanager.pool_classes_by_scheme
+        classes_by_scheme["glance+https"] = HTTPSConnectionPool
+        super(HTTPSAdapter, self).__init__(*args, **kwargs)
 
     def request_url(self, request, proxies):
         # NOTE(flaper87): Make sure the url is encoded, otherwise