Created attachment 839865 [details]
screen-shot: Setup Host Network

Description of problem:
The context menu on a NIC that is already part of a bond contains an option to add this NIC to the bond (which, of course, is unnecessary, as the NIC is already part of the Bond).

Version-Release number of selected component (if applicable):
upstream master / is28 (3.3)

How reproducible:
100%

Steps to Reproduce:
1. Open the 'Setup Host Networks' dialog
2. Drag one of the NICs onto another NIC to form a Bond
[Bond pop-up opens up]
3. fill bond name, bond mode, click "OK"
["bond" is formed, let's call it "bond0"]
4. right click on one of the NICs within "bond0" to open its context menu

Actual results:
one of the items in the context menu is to "Add [NIC] to bond -> bond0". 

Expected results:
you shouldn't be offered to add [NIC] to a bond to which it already belongs.  

Additional info:
this happened when creating the bond in the context of this dialog; not sure what happens when opening the dialog and the bond already exists there.