ipv6: getaddrinfo would fail with scope index

Discard any '%' delimited suffix.

https://github.com/eventlet/eventlet/pull/322

eventlet/support/greendns.py

@@ -99,6 +99,7 @@ def is_ipv6_addr(host):
     """Return True if host is a valid IPv6 address"""
     if not isinstance(host, six.string_types):
         return False
+    host = host.split('%', 1)[0]
     try:
         dns.ipv6.inet_aton(host)
     except dns.exception.SyntaxError:

tests/socket_test.py

@@ -62,3 +62,10 @@ def test_socket_api_family():
     # It was named family_or_realsock
     # https://github.com/eventlet/eventlet/issues/319
     socket.socket(family=socket.AF_INET)
+
+
+def test_getaddrinfo_ipv6_scope():
+    greendns.is_ipv6_addr('::1%2')
+    if not socket.has_ipv6:
+        return
+    socket.getaddrinfo('::1%2', 80, socket.AF_INET6)