RHEV-H network configuration fails with "Error while executing action Setup Networks: unexpected exception." or "'Ifcfg' object has no attribute 'runningConfig"

Issue

• When trying to configure networking on a hypervisor, the admin portal presents this error:

Error while executing action Setup Networks: unexpected exception.

• Looking in the /var/log/messages, the following error from vdsm may be present and correlate to the error in the admin portal:

Jun 11 17:29:23 host1 vdsm vds ERROR unexpected error#012Traceback (most recent call last):#012  File "/usr/share/vdsm/rpc/BindingXMLRPC.py", line 1136, in wrapper#012  File "/usr/share/vdsm/rpc/BindingXMLRPC.py", line 554, in setupNetworks#012  File "/usr/share/vdsm/API.py", line 1398, in setupNetworks#012  File "/usr/share/vdsm/supervdsm.py", line 50, in __call__#012  File "/usr/share/vdsm/supervdsm.py", line 48, in <lambda>#012  File "<string>", line 2, in setupNetworks#012  File "/usr/lib64/python2.6/multiprocessing/managers.py", line 740, in _callmethod#012AttributeError: 'Ifcfg' object has no attribute 'runningConfig