Revert "Workaround for failing tests on openstacksdk change"

This reverts commit c66abfc.
The code has yet to land in nova so ignoring this field was
premature.

Change-Id: Ib5f8134e130de1a0c413b57fa4754824ae6ac3fd
Signed-off-by: Stephen Finucane <stephenfin@redhat.com>

Author: stephenfin

openstackclient/compute/v2/server_event.py

@@ -82,7 +82,7 @@ def machine_readable(self):
 
 
 def _get_server_event_columns(item, client):
-    hidden_columns = ['name', 'server_id', 'links', 'location', 'finish_time']
+    hidden_columns = ['name', 'server_id', 'links', 'location']
 
     if not sdk_utils.supports_microversion(client, '2.58'):
         # updated_at was introduced in 2.58