Add host/port data members to Sentry

Log the new data members on sentry 'down'
Remove unused configuration.engineio code

/cc @zendesk/zendesk-radar

### Steps to merge
 - [ ] :+1: of the team

### References
 - Jira link: 

### Risks
 - Low: adds just a little extra logging information
:+1: after putting this block back, and build passes.