Custom props to replica state in zk

[Alex Bulygin]

Hi all! 
Anyone who know, please tell me, it is possible to add a custom property to 
replica state in zk? While I see that properties are added only to local 
core.propertie.
if this cannot be done, can we create a ticket? I would attach a patch in the 
near future.
P.S.  I want to use this in conjunction with solr-15472, excluding reads on the 
leaders, for whose disks I make indexes