Send 'changes-since' instead of 'changes_since' query parameter

Per API reference, only 'changes-since' is accepted and the variant
with underscore is ignored, making the CLI functionality broken.

[dtroyer] added release note and fixed unit tests.

Change-Id: I0c596531a8af03da17d5ce39d75b12e941403aa5
Closes-Bug: 1732216

openstackclient/compute/v2/server.py

@@ -1056,17 +1056,18 @@ class ListServer(command.Lister):
             'all_tenants': parsed_args.all_projects,
             'user_id': user_id,
             'deleted': parsed_args.deleted,
-            'changes_since': parsed_args.changes_since,
+            'changes-since': parsed_args.changes_since,
         }
         LOG.debug('search options: %s', search_opts)
 
-        if search_opts['changes_since']:
+        if search_opts['changes-since']:
             try:
-                timeutils.parse_isotime(search_opts['changes_since'])
+                timeutils.parse_isotime(search_opts['changes-since'])
             except ValueError:
-                raise exceptions.CommandError(_('Invalid changes-since value:'
-                                              ' %s') % search_opts['changes'
-                                                                   '_since'])
+                raise exceptions.CommandError(
+                    _('Invalid changes-since value: %s') %
+                    search_opts['changes-since']
+                )
 
         if parsed_args.long:
             columns = (

openstackclient/tests/unit/compute/v2/test_server.py

@@ -1584,7 +1584,7 @@ class TestServerList(TestServer):
             'all_tenants': False,
             'user_id': None,
             'deleted': False,
-            'changes_since': None,
+            'changes-since': None,
         }
 
         # Default params of the core function of the command in the case of no
@@ -1791,7 +1791,7 @@ class TestServerList(TestServer):
         parsed_args = self.check_parser(self.cmd, arglist, verifylist)
         columns, data = self.cmd.take_action(parsed_args)
 
-        self.search_opts['changes_since'] = '2016-03-04T06:27:59Z'
+        self.search_opts['changes-since'] = '2016-03-04T06:27:59Z'
         self.search_opts['deleted'] = True
         self.servers_mock.list.assert_called_with(**self.kwargs)
 

releasenotes/notes/bug-1732216-b41bfedebff911e1.yaml

@@ -0,0 +1,5 @@
+---
+fixes:
+  - |
+    Fix the operation of the ``--changes-since`` option to the ``server list`` command.
+    [Bug `1732216 <https://bugs.launchpad.net/python-openstackclient/+bug/1732216>`_]