mongoldap should not print each acquired role's database inline

mongoldap's output currently looks like this:

Executing query against LDAP server...

[OK] Successfully acquired the following roles:

        * cn=testWriter,ou=Groups,dc=10gen,dc=cc@admin

Because every role produced for LDAP authorization lives in the 'admin' database, every role will be suffixed with '@admin'. It seems that administrators will occasionally copy-paste the entire bullet point, including the suffix, which doesn't work.

A better way to do this may be:

Executing query against LDAP server...

[OK] Successfully acquired the following roles on the 'admin' database:

        * cn=testWriter,ou=Groups,dc=10gen,dc=cc