Created attachment 594414 [details]
vdsm.log + engine.log + ifcfg files

Description of problem:
When host network interface is setup with Boot Protocol: DHCP (see screenshot 1) it gets correctly configured, but UI displays its configuration as none when opened second time. (see screenshot2). Same problem applies to boned and single interface.

Version-Release number of selected component (if applicable):
oVirt Engine Version: 3.1.0-2.el6ev 
vdsm-4.9.6-17.0.el6.x86_64

How reproducible:
100%
Steps to Reproduce:
1. create and attach logical network to cluster
2. Hosts -> your host - Network Interfaces -> Setup Host Networks -> attach logical network to interface -> click on logical network pencil icon -> select DHCP -> click OK -> chec save network configuration -> click OK
3. in case hosts becomes non responsive fix default route on host back to rhevm
4. Hosts -> your host - Network Interfaces -> Setup Host Networks -> attach logical network to interface -> click on logical network pencil icon -> see that Boot Protocol: None is diplayed
  
Actual results:
Network configured to use DHCP to obtain IP has checked Boot Protocol None

Expected results:
Network configured to use DHCP to obtain IP has checked Boot Protocol DHCP

Additional info:
vdsm.log + engine.log + ifcfg files attached