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Description of problem:
After VLAN profile is created and saved it's device cannot be changed. VLAN id can be, VLAN interface can be changed as well but is not changed in ifcfg file and once edited again it's back to previous value 

Version-Release number of selected component (if applicable):
NetworkManager-1.0.6-27.el7.x86_64
control-center-3.14.5-8.el7.x86_64

How reproducible:
always

Steps to Reproduce:
1.create VLAN with ID 90 and device eth1 
2.save it
3.edit the connection and change ID and device to 80 and eth1.80 for example 
4.save

Actual results:
device is not changed

Expected results:
device should be changed

Additional info:

Works as expected in rawhide (maybe there is a backportable fix).
Another thing I notice is that the sidebar item for the VLAN is not updated if I change the name. I have to reload the panel for the new name to be reflected in the sidebar.

Support for enterprise networking features will be removed in future versions
of GNOME and of RHEL 7.x. We advise that you test Cockpit instead, which is
better suited to manipulate enterprise networking feature.

Teaming support for Cockpit is tracked at:
https://github.com/cockpit-project/cockpit/issues/4330

Bonding, bridging and VLAN support are already implemented.