python.pkgs.python-gnupg: disable failing test test_search_keys

reading the code, it's hard to see how this test was *ever* supposed to
pass. interestingly, peeking across the fence, guix have disabled this test
too for the same reason.

note that tests don't actually run *at all* on py27 but that's a problem
for another day

pkgs/development/python-modules/python-gnupg/default.nix

@@ -17,7 +17,8 @@ buildPythonPackage rec {
     substituteInPlace gnupg.py \
     --replace "gpgbinary='gpg'" "gpgbinary='${gnupg1}/bin/gpg'"
     substituteInPlace test_gnupg.py \
-    --replace "gpgbinary=GPGBINARY" "gpgbinary='${gnupg1}/bin/gpg'"
+    --replace "gpgbinary=GPGBINARY" "gpgbinary='${gnupg1}/bin/gpg'" \
+    --replace "test_search_keys" "disabled__test_search_keys"
   '';
 
   meta = with stdenv.lib; {