Fix attribute error

PR:		217867
Submitted by:	Alexander Nusov <alexander.nusov@nfvexpress.com>

net/py-eventlet/Makefile

@@ -3,6 +3,7 @@
 
 PORTNAME=	eventlet
 PORTVERSION=	0.20.1
+PORTREVISION=	1
 CATEGORIES=	net python
 MASTER_SITES=	CHEESESHOP
 PKGNAMEPREFIX=	${PYTHON_PKGNAMEPREFIX}

net/py-eventlet/files/patch-eventlet_support_greendns.py

@@ -0,0 +1,27 @@
+--- eventlet/support/greendns.py.orig	2017-03-29 21:00:19 UTC
++++ eventlet/support/greendns.py
+@@ -79,8 +79,14 @@ DNS_QUERY_TIMEOUT = 10.0
+ HOSTS_TTL = 10.0
+ 
+ EAI_EAGAIN_ERROR = socket.gaierror(socket.EAI_AGAIN, 'Lookup timed out')
+-EAI_NODATA_ERROR = socket.gaierror(socket.EAI_NODATA, 'No address associated with hostname')
+ EAI_NONAME_ERROR = socket.gaierror(socket.EAI_NONAME, 'Name or service not known')
++# EAI_NODATA was removed from RFC3493, it's now replaced with EAI_NONAME
++# socket.EAI_NODATA is not defined on FreeBSD, probably on some other platforms too.
++# https://lists.freebsd.org/pipermail/freebsd-ports/2003-October/005757.html
++EAI_NODATA_ERROR = EAI_NONAME_ERROR
++if (os.environ.get('EVENTLET_DEPRECATED_EAI_NODATA', '').lower() in ('1', 'y', 'yes')
++        and hasattr(socket, 'EAI_NODATA')):
++    EAI_NODATA_ERROR = socket.gaierror(socket.EAI_NODATA, 'No address associated with hostname')
+ 
+ 
+ def is_ipv4_addr(host):
+@@ -448,7 +454,7 @@ def _getaddrinfo_lookup(host, family, fl
+             try:
+                 answer = resolve(host, qfamily, False)
+             except socket.gaierror as e:
+-                if e.errno not in (socket.EAI_AGAIN, socket.EAI_NODATA):
++                if e.errno not in (socket.EAI_AGAIN, EAI_NONAME_ERROR.errno, EAI_NODATA_ERROR.errno):
+                     raise
+                 err = e
+             else: