rules: get_developer_information_url: query by login, not email

DDPO page can query with either email=email_address or login=email_address. In the latter case, the query can also show other packages maintained by the same maintainer but under a different email address. This change would use the login= query and show the complete information about packages under one maintainer name.

Please let me know if it works for you. The tests have been updated as well. Many thanks!