Audit BGP configuration error squashing. #6245
Description
It's been observed in
- 500 error returned on BGP config create. #6244
- Report of 500 returned from deleting a BGP configuration.
There are places in the networking API where we squash errors that should carry useful diagnostic information into generic 500s. This is bad for operators as it leaves them guessing about what's going wrong. We should audit the networking APIs to seek out and correct the places where this is happening.