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>'

macros

@@ -179,9 +179,6 @@ unset DISPLAY\
 
 %__global_cflags	-O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector --param=ssp-buffer-size=4
 
-# Disable lookups
-%_hkp_keyserver  %{nil}
-
 # Use these macros to differentiate between RH and other KMP implementation(s).
 redhat_kernel_module_package	1
 kernel_module_package_release	1