Configure many BIS legacy domains on transition tool

This pull request contains the configuration of many (but not all) BIS legacy domains on the transition tool. 

Additionally, it allows for previously configured domains to use the global append path feature where appropriate.
Current configuration in the DNS is 
```
diversity.bis.gov.uk.	299	IN	CNAME	elearning.bis.gov.uk.
elearning.bis.gov.uk.	299	IN	A	94.236.0.35
```
I took this to mean they were part of the same host sometime in the past.  We could split them or we could leave them as one, pending post-merge commentary from the team at BIS?