More on ares; different results under linux.

gevent/_socketcommon.py

@@ -222,8 +222,11 @@ def getfqdn(name=''):
     else:
         aliases.insert(0, hostname)
         for name in aliases:
+            if isinstance(name, bytes):
                 if b'.' in name:
                     break
+            elif '.' in name:
+                break
         else:
             name = hostname
     return name