added support for proxy into slack plugin, removed some sensitive information from message

Change-Id: I071b74eac9b805380ba4f92cdad2c9f2f84f04d4
diff --git a/sensu/files/handlers/slack.json b/sensu/files/handlers/slack.json
index 2ec633c..c12adfb 100644
--- a/sensu/files/handlers/slack.json
+++ b/sensu/files/handlers/slack.json
@@ -23,6 +23,12 @@
   "slack": {
     "webhook_url": "{{ handler.webhook_url }}",
     "channel": "{{ handler.channel }}",
+    {%- if handler.proxy_address is defined %}
+    "proxy_addr": "{{ handler.proxy_address }}",
+    {%- endif %}
+    {%- if handler.proxy_port is defined %}
+    "proxy_port": "{{ handler.proxy_port }}",
+    {%- endif %}
     "markdown_enabled": false
   }
 }
diff --git a/sensu/files/plugins/handlers/notification/slack.rb b/sensu/files/plugins/handlers/notification/slack.rb
index b80c7d0..32343cf 100644
--- a/sensu/files/plugins/handlers/notification/slack.rb
+++ b/sensu/files/plugins/handlers/notification/slack.rb
@@ -57,20 +57,30 @@
     @event['client']['name'] + '/' + @event['check']['name']
   end
 
+  def incident_host
+    @event['client']['name']
+  end
+
+  def incident_check
+    @event['check']['name']
+  end
+
+  def incident_ip
+    @event['client']['address']
+  end
+
   def get_setting(name)
     settings[config[:json_config]][name]
   end
 
   def handle
     description = @event['check']['notification'] || build_description
-    post_data("*Check*\n#{incident_key}\n\n*Description*\n#{description}")
+    post_data("*Host*: #{incident_host} \n\n*Check*: #{incident_check}\n#{description}")
   end
 
   def build_description
     [
       @event['check']['output'].strip,
-      @event['client']['address'],
-      @event['client']['subscriptions'].join(',')
     ].join(' : ')
   end