Open Stack

Hi folks!

Recently I implemented a patch that allows resetting session persistence 
for a VIP: https://review.openstack.org/#/c/20725/.
What I noticed is that it's not possible to use this feature from the 
command line. The problem seems to be quite general because there's no 
way of specifying None values for attributes.

As some of you noticed in the review Yong (gongysh) has made some 
changes that allow to specify action=clear in the quantum-client's shell 
and that will send a None value: 
https://review.openstack.org/#/c/17436/. Unfortunately that change is 
abandoned right now because we didn't came up with a consensus about 
dealing with None values in command line environment.

I think it's reasonable to re-initiate this discussion because 
specifying None values from the command line is quite a necessary thing 
now and it needs a generic solution.


- Roman