Merge pull request #1879 from r2d4/map_hash_bucket_size

Automatic merge from submit-queue

Make map_hash_bucket_size configurable

I was getting an error while trying to run the nginx controller in minikube.  This allows this nginx configuration option to be passed in through a configmap.  

The default value depends on the processor's cache line size (32 | 64 | 128), however ServerNameHashBucketSize is determined similarly, so I've set it to the same default (64).

Fixes #1817

ref https://github.com/kubernetes/minikube/issues/611

cc @bprashanth

controllers/nginx/nginx.tmpl

@@ -59,6 +59,7 @@ http {
     types_hash_max_size 2048;
     server_names_hash_max_size {{ $cfg.serverNameHashMaxSize }};
     server_names_hash_bucket_size {{ $cfg.serverNameHashBucketSize }};
+    map_hash_bucket_size {{ $cfg.mapHashBucketSize }};
 
     include /etc/nginx/mime.types;
     default_type text/html;