Disable OEM on KCS

When using KCS, OEM extensions are not going
to work well.  For now, disable such extensions.

Change-Id: Ic9668ec00906382f4aba94eff0b33ff270869d6b

pyghmi/ipmi/command.py

@@ -25,6 +25,7 @@ import pyghmi.constants as const
 import pyghmi.exceptions as exc
 import pyghmi.ipmi.events as sel
 import pyghmi.ipmi.fru as fru
+import pyghmi.ipmi.oem.generic as genericoem
 from pyghmi.ipmi.oem.lookup import get_oem_handler
 import pyghmi.ipmi.private.util as pygutil
 from pyghmi.ipmi import sdr
@@ -249,6 +250,10 @@ class Command(object):
         """
         if self._oemknown:
             return
+        if self.bmc is None:
+            self._oem = genericoem.OEMHandler(None, None)
+            self._oemknown = True
+            return
         self._oem, self._oemknown = get_oem_handler(self._get_device_id(),
                                                     self)