Some slight 2.6 compatibility changes

eventlet/green/socket.py

@@ -3,6 +3,11 @@ for var in __socket.__all__:
     exec "%s = __socket.%s" % (var, var)
 _fileobject = __socket._fileobject
 
+try:
+    sslerror = socket.sslerror
+except AttributeError:
+    pass
+
 from eventlet.api import get_hub
 from eventlet.util import wrap_ssl_obj
 from eventlet.greenio import GreenSocket as socket

eventlet/green/threading.py

@@ -339,6 +339,8 @@ class _Event(_Verbose):
 
     def isSet(self):
         return self.__flag
+        
+    is_set = isSet
 
     def set(self):
         self.__cond.acquire()