Revert "put default options for memcache timeouts"

This reverts commit a2f66ed87452e1369aa515c0116572d33b76b37b.

Options that were added have never been used with upstream
cache backend, and since backend is hardocded in MCP they are
useless.

Change-Id: I18366472feca3b275b438629408f2991044c050d
Related-Prod: PROD-21271
diff --git a/horizon/files/horizon_settings/_local_settings.py b/horizon/files/horizon_settings/_local_settings.py
index 476272a..cc5d096 100644
--- a/horizon/files/horizon_settings/_local_settings.py
+++ b/horizon/files/horizon_settings/_local_settings.py
@@ -28,14 +28,6 @@
 
 CACHES = {
     'default': {
-{# TODO(vsaienko) remove this as we do not have custom cache backend starting from Pike #}
-{%- if server.version in ['mitaka', 'newton', 'ocata'] %}
-        'OPTIONS': {
-                'DEAD_RETRY': 1,
-                'SERVER_RETRIES': 1,
-                'SOCKET_TIMEOUT': 1,
-        },
-{%- endif %}
         'BACKEND': 'django.core.cache.backends.memcached.MemcachedCache',
         {%- if app.cache.members is defined %}
         'LOCATION': "{%- for member in app.cache.members %}{{ member.host }}:{{ member.port }}{% if not loop.last %};{% endif %}{%- endfor %}"