Fix bmc network configuration over ipv6 client

Change-Id: I62c6f774085a863e28481918d7072faff8594c5e

pyghmi/redfish/command.py

@@ -254,6 +254,7 @@ class Command(object):
         self._varfwinventory = None
         self._oem = None
         self._gpool = pool
+        self._bmcv4ip = None
         for addrinf in socket.getaddrinfo(bmc, 0, 0, socket.SOCK_STREAM):
             if addrinf[0] == socket.AF_INET:
                 self._bmcv4ip = socket.inet_pton(addrinf[0], addrinf[-1][0])