Skip network tests when getaddrinfo() returns EAI_AGAIN, meaning a temporary
failure in name resolution.

Should fix a buildbot failure.
diff --git a/Misc/NEWS b/Misc/NEWS
index e4ddb3c..b550cc2 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -19,6 +19,9 @@
 Tests
 -----
 
+- Skip network tests when getaddrinfo() returns EAI_AGAIN, meaning a temporary
+  failure in name resolution.
+
 - Avoid failing in test_urllibnet.test_bad_address when some overzealous
   DNS service (e.g. OpenDNS) resolves a non-existent domain name.  The test
   is now skipped instead.