Allow customizing separator for api-paste.ini

The api-paste.ini accepts not only "=" but also ":" and some services
like Barbican have been using ":" for their default api-paste.ini
files.

[composite:main]
use = egg:Paste#urlmap
/: barbican_version
/v1: barbican-api-keystone

This change allows users to use ":" so that they can update the ini
files with keeping it consistent with the default fules

Depends-on: https://review.opendev.org/813614
Change-Id: I843154a46ac61c8ea54a7b28a42ad154568a845e

lib/puppet/type/aodh_api_paste_ini.rb

@@ -45,6 +45,11 @@ Puppet::Type.newtype(:aodh_api_paste_ini) do
     defaultto('<SERVICE DEFAULT>')
   end
 
+  newparam(:key_val_separator) do
+    desc 'The separator string to use between each setting name and value.'
+    defaultto('=')
+  end
+
   autorequire(:anchor) do
     ['aodh::install::end']
   end

releasenotes/notes/api_paste_ini-separator-5244b86741750162.yaml

@@ -0,0 +1,5 @@
+---
+features:
+  - |
+    The new ``key_val_separator`` parameter has been added to
+    the ``aodh_api_paste_ini`` resource type.