Delete tests for aka.bis.gov.uk

bis has been managed by transition for some time, and now that it
has fully transitioned we shouldn't need to test the aka domain anyway.
Delete popular tests for decc_og

This site has been managed by transition for some time.
Merge pull request #728 from alphagov/delete_aka_bis_tests

Delete tests for aka.bis.gov.uk
Merge pull request #729 from alphagov/delete_decc_og_popular_tests

Delete popular tests for decc_og
Update sitemap tool to remove single quotes
Merge pull request #731 from rjc123/admin

Update sitemap tool to remove single quotes from sitemap list, and include pdfs
Replace piplink rule with individual mappings
Remove businesslink homepage and search rules and replace with mappings
Remove more hardcoded rules from businesslink config
Minor cleanup, ordering and mapping fix
Configure DSTL and CDE on transition tool
Use fake header for sitemap of dwp site
Merge pull request #734 from rjc123/admin

Use fake header for sitemap of dwp site
Merge pull request #733 from rjc123/newmappings

Configure DSTL and CDE on transition tool
Merge pull request #732 from rjc123/businesslink

Replacing businesslink rules with mappings
Add GDS as organisation to all directgov and businesslink sites
Add a rake task to validate that hosts appear only once

A host should never appear on multiple sites at once. We want to be
able to reassign hosts to other sites in Transition's orgs_sites_hosts
import, and this task makes that a little safer. The task is included
in the CI build so that we can see clearly if any duplicate hosts are
present across all site yaml files.
Merge pull request #736 from rjc123/newmappings

Add GDS as organisation to all directgov and businesslink sites
Merge pull request #737 from alphagov/validate_hosts_unique

Add a rake task to validate that hosts appear only once
New date for DCLG LF