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Description of problem:
I can add uuid of any network I want into secondaries as neither documentation not describe say anything that it's not allowed. There is just an error written in messages that connection is not vpn. 

Version-Release number of selected component (if applicable):
NetworkManager-0.9.9.1-13.git20140326.4dba720.el7.x86_64

How reproducible:
always

Steps to Reproduce:
1.add wireless profile as an ethernet's secondary
2.nmcli connection edit id ethernet
3.set connection.secondary uuid_of_wireless_profile
4.nmcli con up id ethernet

Actual results:
both fails with error that wireless profile is not vpn in messages

Expected results:
some warning in nmcli that this is unsupported or describe saying that or man pages at least

Additional info:

The nmcli specific description has been added by this commit:
645f020 nmcli: improve setting connection.secondaries property

But we may still do some enhancements:
* update the property's description itself
* restrict setting secondaries to only VPNs in nmcli
* implement TAB completion in nmcli editor for secondaries
The changes are available in upstream branch jk/secondaries-rh1094296.

Looks good to me

jk/secondaries-rh1094296 looks good to me.

Changes committed to upstream master:
e6f1c83 cli: TAB completion for connection.secondaries
7696238 cli: only allow setting VPN connection as secondaries in editor
e3d1e17 libnm-util: make explicit that we only allow VPN as secondaries (rh #1094296)

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://rhn.redhat.com/errata/RHBA-2015-0311.html