Add datadog_monitor option to set the config file name

This allows people to use the integration multiple times and place
different config files in the same integration directory.  The use case
would be many different cookbooks adding a single check they care about
without doing messy attribute overrides.

resources/monitor.rb

@@ -35,6 +35,7 @@
 property :use_integration_template, [TrueClass, FalseClass], required: false, default: false
 property :is_jmx, [TrueClass, FalseClass], required: false, default: false
 property :logs, [Array, nil], required: false, default: []
+property :config_name, [String, nil], required: false, default: 'conf'
 
 action :add do
   Chef::Log.debug("Adding monitoring for #{new_resource.name}")
@@ -49,7 +50,7 @@
         mode '755'
       end
     end
-    yaml_file = ::File.join(yaml_dir, "#{new_resource.name}.d", 'conf.yaml')
+    yaml_file = ::File.join(yaml_dir, "#{new_resource.name}.d", "#{config_name}.yaml")
   else
     yaml_file = ::File.join(yaml_dir, "#{new_resource.name}.yaml")
   end
@@ -101,7 +102,7 @@
 
 action :remove do
   yaml_file = if Chef::Datadog.agent_major_version(node) != 5
-                ::File.join(yaml_dir, "#{new_resource.name}.d", 'conf.yaml')
+                ::File.join(yaml_dir, "#{new_resource.name}.d", "#{config_name}.yaml")
               else
                 ::File.join(yaml_dir, "#{new_resource.name}.yaml")
               end

test/cookbooks/test/recipes/monitor_add.rb

@@ -15,3 +15,8 @@
 datadog_monitor 'potato' do
   action :add
 end
+
+datadog_monitor 'potato' do
+  action :add
+  config_name 'potato-one'
+end

test/cookbooks/test/recipes/monitor_remove.rb

@@ -15,3 +15,8 @@
 datadog_monitor 'potato' do
   action :remove
 end
+
+datadog_monitor 'potato' do
+  action :remove
+  config_name 'potato-one'
+end