remove unused nginx salt

'aws', 'gce', 'vagrant', 'vsphere' are all the cloud providers

cluster/saltbase/salt/nginx/init.sls

@@ -1,64 +0,0 @@
-nginx:
-  pkg:
-    - installed
-
-/etc/nginx/nginx.conf:
-  file:
-    - managed
-    - source: salt://nginx/nginx.conf
-    - template: jinja
-    - user: root
-    - group: root
-    - mode: 644
-
-/etc/nginx/sites-enabled/default:
-  file:
-    - managed
-    - makedirs: true
-    - source: salt://nginx/kubernetes-site
-    - user: root
-    - group: root
-    - mode: 644
-
-/usr/share/nginx/htpasswd:
-  file:
-    - managed
-    - source: salt://nginx/htpasswd
-    - user: root
-    - group: root
-    - mode: 644
-
-{% if grains.cloud is defined and grains.cloud in ['gce'] %}
-/etc/kubernetes/manifests/nginx.json:
-  file:
-    - managed
-    - source: salt://nginx/nginx.json
-    - user: root
-    - group: root
-    - mode: 644
-    - require:
-      - file: /etc/nginx/nginx.conf
-      - file: /etc/nginx/sites-enabled/default
-      - file: /usr/share/nginx/htpasswd
-      - cmd: kubernetes-cert      
-
-
-#stop legacy nginx_service 
-stop_nginx-service:
-  service.dead:
-    - name: nginx
-    - enable: None
-
-{% else %}
-nginx-service:
-  service:
-    - running
-    - name: nginx
-    - watch:
-      - pkg: nginx
-      - file: /etc/nginx/nginx.conf
-      - file: /etc/nginx/sites-enabled/default
-      - file: /usr/share/nginx/htpasswd
-      - cmd: kubernetes-cert
-{% endif %}
-