Created attachment 1237513 [details]
record

Description of problem:
[SR-IOV] - Labels list in the "Edit Virtual Functions" dialog display and allow to choose labels that already been specified.

We displaying and allowing to choose the same label entry over and over altough it already specified in the first entry. But when we trying to approve we can't and all the duplicated label entries colored in red and tooltip saying "this label has already been specified in another entry."

We shouldn't display a label in the labels list if it's already been specified once. 

Version-Release number of selected component (if applicable):
4.1.0-0.4.master.20170104122005.git51b1bcf.el7.centos

How reproducible:
100

Steps to Reproduce:
1. Edit Virtual Functions dialog and specify network via label
2. Add this label few more times in the same dialog
3. Try to approve operation

Actual results:
Failed. "this label has already been specified in another entry."

Expected results:
We shouldn't display a label in the labels list if it's already been specified once. 

Additional info:
Attaching record.