[ClusterLabs] Cannot stop cluster due to order constraint

[Leon Steffens]

>> 
>> pcs constraint order start main1 then stop backup1 kind=Serialize
> 
> I think you want kind=Optional here. "Optional" means that if both
> actions are needed in the same transition, perform them in this order,
> otherwise it doesn't limit anything. "Serialize" means the start and
> stop can happen in either order, but not simultaneously, and backup1
> can't stop unless main1 is starting.


Thanks Ken!  Looking at it now, it seems so obvious - not sure why we didn’t even consider that.
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