Leave rpm's hkp keyserver configuration alone
    - rpm < 4.6 used to try and fetch and import any missing keys from
      keyserver automatically on rpmdb iteration if hkp_keyserver was set, which
      caused hideous slowdowns and huge load on pgp keyservers AND was a
      security hazard as rpm thinks imported == trusted key. This is safe
      enable now as rpm will only ever import keys when explicitly told to do
      so with --import
    - this makes pgp import directly from PGP servers work, ie
       'rpm --import 0x<keyid>'