Add a special_redirect_strategy line to some of the site YAML files

- Only a few of them based on which sites have this field not set to nil
  in the transition database.
Merge pull request #861 from alphagov/add_special_redirect_strategy_lines_to_sites

Add a special_redirect_strategy line to some of the site YAML files
Remove insignificant querystring params

Conflicts:
	data/transition-sites/hmrc_customs.yml