Description of problem:
[Network Filter] - Remove 'allow-dhcp-server' filter from the network filters list in the vNIC profile dialog.

This filter is currently not supported and not working --> 
" VM vm-5 is down with error. Exit message: internal error: Cannot instantiate filter due to unresolvable variables or unavailable list elements: DHCPSERVER"

DHCPSERVER is currently not defined. A RFE will be opened to let admin to define such parameter per vNIC profile. But until then this network filter should be removed from the list in the vNIC profile dialog. 


Version-Release number of selected component (if applicable):
4.0.0-0.7.master.el7ev

How reproducible:
100 

Steps to Reproduce:
1. Try to run VM with 'allow-dhcp'server' network filter in the vNIC profile.


Actual results:
VM failed to run with error:

"VM vm-5 is down with error. Exit message: internal error: Cannot instantiate filter due to unresolvable variables or unavailable list elements: DHCPSERVER"

Expected results:
If the filter isn't supported, it shouldn't appear in the network filters list.