add 'hostname' for scanning host to object 'research-scanner'

[bynt]

researchers use different hostnames for the scans, e.g.

• fb02itsscan01.REDACTED.de
• fb02itsscan02.REDACTED.de
• fb02itsscan06.REDACTED.de .. we want to keep track of those as well

[adulau]

Indeed, thank you very much for the contribution.