Only close cache on post_fork() if cache supports it.

In particular LocMemCache doesn't have this option.

playbooks/roles/analytics_api/templates/edx/app/analytics_api/analytics_api_gunicorn.py.j2

@@ -17,6 +17,7 @@ def post_fork(server, worker):
     another worker.
     """
     from django.core.cache import cache
-    cache.close()
+    if hasattr(cache, 'close'):
+        cache.close()
 
 {{ ANALYTICS_API_GUNICORN_EXTRA_CONF }}

playbooks/roles/ansible-role-django-ida/templates/templates/edx/app/ROLE_NAME/ROLE_NAME_gunicorn.py.j2

@@ -17,6 +17,7 @@ def post_fork(server, worker):
     another worker.
     """
     from django.core.cache import cache
-    cache.close()
+    if hasattr(cache, 'close'):
+        cache.close()
 
 {{ '{{' }} {{ role_name|upper }}_GUNICORN_EXTRA_CONF }}

playbooks/roles/ecommerce/templates/edx/app/ecommerce/ecommerce_gunicorn.py.j2

@@ -17,6 +17,7 @@ def post_fork(server, worker):
     another worker.
     """
     from django.core.cache import cache
-    cache.close()
+    if hasattr(cache, 'close'):
+        cache.close()
 
 {{ ECOMMERCE_GUNICORN_EXTRA_CONF }}

playbooks/roles/edx_notes_api/templates/edx/app/edx_notes_api/edx_notes_api_gunicorn.py.j2

@@ -24,6 +24,7 @@ def post_fork(server, worker):
     another worker.
     """
     from django.core.cache import cache
-    cache.close()
+    if hasattr(cache, 'close'):
+        cache.close()
 
 {{ EDX_NOTES_API_WORKERS_EXTRA_CONF }}

playbooks/roles/edxapp/templates/cms_gunicorn.py.j2

@@ -28,6 +28,7 @@ def post_fork(server, worker):
     another worker.
     """
     from django.core.cache import cache
-    cache.close()
+    if hasattr(cache, 'close'):
+        cache.close()
 
 {{ EDXAPP_CMS_GUNICORN_EXTRA_CONF }}

playbooks/roles/edxapp/templates/lms_gunicorn.py.j2

@@ -28,6 +28,7 @@ def post_fork(server, worker):
     another worker.
     """
     from django.core.cache import cache
-    cache.close()
+    if hasattr(cache, 'close'):
+        cache.close()
 
 {{ EDXAPP_LMS_GUNICORN_EXTRA_CONF }}

playbooks/roles/gitreload/templates/edx/app/gitreload/gitreload_gunicorn.py.j2

@@ -19,6 +19,7 @@ def post_fork(server, worker):
     another worker.
     """
     from django.core.cache import cache
-    cache.close()
+    if hasattr(cache, 'close'):
+        cache.close()
 
 {{ GITRELOAD_GUNICORN_EXTRA_CONF }}

playbooks/roles/ora/templates/ora_gunicorn.py.j2

@@ -18,6 +18,7 @@ def post_fork(server, worker):
     another worker.
     """
     from django.core.cache import cache
-    cache.close()
+    if hasattr(cache, 'close'):
+        cache.close()
 
 {{ ORA_GUNICORN_EXTRA_CONF }}

playbooks/roles/programs/templates/edx/app/programs/programs_gunicorn.py.j2

@@ -17,6 +17,7 @@ def post_fork(server, worker):
     another worker.
     """
     from django.core.cache import cache
-    cache.close()
+    if hasattr(cache, 'close'):
+        cache.close()
 
 {{ PROGRAMS_GUNICORN_EXTRA_CONF }}

playbooks/roles/xqueue/templates/xqueue_gunicorn.py.j2

@@ -24,6 +24,7 @@ def post_fork(server, worker):
     another worker.
     """
     from django.core.cache import cache
-    cache.close()
+    if hasattr(cache, 'close'):
+        cache.close()
 
 {{ XQUEUE_GUNICORN_WORKERS_EXTRA_CONF }}

playbooks/roles/xserver/templates/xserver_gunicorn.py.j2

@@ -18,6 +18,7 @@ def post_fork(server, worker):
     another worker.
     """
     from django.core.cache import cache
-    cache.close()
+    if hasattr(cache, 'close'):
+        cache.close()
 
 {{ XSERVER_GUNICORN_EXTRA_CONF }}