re-merging previously reverted commit for adding import-via/export-via attributes to aut-num object

Revert "Revert "Merged https://github.com/job/whois adding import-via/export-via attributes to aut-num: object""

This reverts commit 33bd9a6d6e863068d66cd1fe60d7ed4a36028600.
path changes for re-merging the export/import via attributes

paths were changed because we created the whois-client
 module in between