Skip network tests when getaddrinfo() returns EAI_AGAIN, meaning a temporary

failure in name resolution.

Should fix a buildbot failure.

Lib/test/support.py

@@ -867,6 +867,7 @@ def transient_internet(resource_name, *, timeout=30.0, errnos=()):
         ('ETIMEDOUT', 110),
     ]
     default_gai_errnos = [
+        ('EAI_AGAIN', -3),
         ('EAI_NONAME', -2),
         ('EAI_NODATA', -5),
         # Encountered when trying to resolve IPv6-only hostnames

Misc/NEWS

@@ -19,6 +19,9 @@ Library
 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.