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[placement][nova][ptg] Protecting driver-provided traits

Chris Dent <cdent+os at anticdent.org> wrote: 
>On Wed, 10 Apr 2019, Eric Fried wrote: 
>>Today we've got the principle of "don't do that," which we've expressed 
>>in the docs: 
>>Trying to enforce those principles programmatically beyond what we've 
>>already done is going to be tricky, and as long as operators behave and 
>>read the docs (even if it's after we've marked their bug report as 
>>Invalid with the above link), mork work than benefit. 
>>So I'm going to vote "do nothing for now". 
>I'm kinda there too, but aspiers put the stuff on the etherpad and 
>seemed to have some concerns, hopefully he'll join in here. 

Not so much concerns as just trying to make sure we don't miss an 
opportunity to discuss something in person which seemed to cause 
multiple discussions / redesigns over many months.  For example would 
it be worth considering tweaking the placement API so that only the 
driver can set/unset traits which it owns?  This would avoid the 
corner case conflict we currently have where a naughty admin messes 
around with driver traits on RPs. 

But I'm also fine with "do nothing for now", if that's the current 
consensus.  Although perhaps it would be better to at least spend 5 
minutes finding a good place in the docs to insert the Venn diagram: