Bug 1118699

+++ This bug was initially created as a clone of Bug #1116577 +++

Description of problem:
If you add/remove ethtool_opts you get an error: BindingXMLRPC::1126::vds::(wrapper) unexpected error in VDSM log, though an action succeeds

Version-Release number of selected component (if applicable):


How reproducible:
From time to time

Steps to Reproduce:
1. Add ethtool_opts in GUI or remove it (sometimes you see it when creating and sometimes when deleting ethtool_opts)
2. Check VDSM and Engine logs
3.

Actual results:
Unexpected exception Error in VDSM log and Failed to GetStatsVDS, error = Unexpected exception, code = 16 in engine log

Expected results:
No error messages in the logs

Additional info:
Usually it happens when trying to remove ethtool_opts with '-' sign in GUI

--- Additional comment from Dan Kenigsberg on 2014-07-08 11:58:53 IDT ---

Thread-709::DEBUG::2014-07-06 15:54:25,853::sampling::619::vds::(_getInterfacesStats) Rate above 100%. DEBUG: ifid eth1 interval: 8.11740493774 thisRx 4293800384 thisTx 4294966838 samples [(1404651256.1012111, 1166912, 458), (1404651258.113075, 1176526, 458), (1404651260.125016, 1186458, 458), (1404651262.197691, 0, 0), (1404651264.218616, 0, 0)]
Thread-709::ERROR::2014-07-06 15:54:25,854::BindingXMLRPC::1126::vds::(wrapper) unexpected error
Traceback (most recent call last):
  File "/usr/share/vdsm/rpc/BindingXMLRPC.py", line 1110, in wrapper
    res = f(*args, **kwargs)
  File "/usr/share/vdsm/rpc/BindingXMLRPC.py", line 455, in getStats
    return api.getStats()
  File "/usr/share/vdsm/API.py", line 1245, in getStats
    decStats = self._cif._hostStats.get()
  File "/usr/share/vdsm/virt/sampling.py", line 514, in get
    stats = self._getInterfacesStats()
  File "/usr/share/vdsm/virt/sampling.py", line 619, in _getInterfacesStats
    for hs in self._samples])
KeyError: 'kaka'