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
To be clear, this lets anyone change the underlying engine-io version when radar is used as a package.