Remove the digest_algorithm option

This option has had no effect since the removal of native SSL support in
06b2465f59 .

Change-Id: I7ad94bd2be45a25c9c1dccc552fa9110fc4862aa

doc/source/configuration/configuring.rst

@@ -1703,22 +1703,6 @@ load balancer URL would be used for this value.
 ``public_endpoint=<None|URL>``
   Optional. Default: ``None``
 
-Configuring Glance digest algorithm
------------------------------------
-
-Digest algorithm that will be used for digital signature. The default
-is sha256. Use the command::
-
-  openssl list-message-digest-algorithms
-
-to get the available algorithms supported by the version of OpenSSL on the
-platform. Examples are "sha1", "sha256", "sha512", etc. If an invalid
-digest algorithm is configured, all digital signature operations will fail and
-return a ValueError exception with "No such digest method" error.
-
-``digest_algorithm=<algorithm>``
-  Optional. Default: ``sha256``
-
 Configuring http_keepalive option
 ---------------------------------
 

glance/common/config.py

@@ -530,6 +530,11 @@ Related options:
 """)),
     cfg.StrOpt('digest_algorithm',
                default='sha256',
+               deprecated_for_removal=True,
+               deprecated_since="Dalmatian",
+               deprecated_reason=_("""
+This option has had no effect since the removal of native SSL support.
+"""),
                help=_("""
 Digest algorithm to use for digital signature.
 

glance/tests/unit/common/test_wsgi.py

@@ -732,9 +732,6 @@ class GetSocketTestCase(test_utils.BaseTestCase):
         self.useFixture(fixtures.MonkeyPatch(
             "glance.common.wsgi.time.time",
             mock.Mock(side_effect=[0, 1, 5, 10, 20, 35])))
-        self.useFixture(fixtures.MonkeyPatch(
-            "glance.common.wsgi.utils.validate_key_cert",
-            lambda *x: None))
         wsgi.CONF.tcp_keepidle = 600
 
     @mock.patch.object(prefetcher, 'Prefetcher')

releasenotes/notes/deprecate-digest_algorithm-7cab4ef4240c522f.yaml

@@ -0,0 +1,10 @@
+---
+deprecations:
+  - |
+    The ``digest_algorithm`` configuration option has been deprecated in this
+    release and is subject to removal at the beginning of the F development
+    cycle, following the
+    `OpenStack standard deprecation policy
+    <https://governance.openstack.org/reference/tags/assert_follows-standard-deprecation.html>`_.
+
+    This option has had no effect since the removal of native SSL support.