MB-51458 do not copy the whole ns_config when computing quirks

ensuring consistent snapshot is not important here, because all
the keys involved are changed seldom and via diag/eval

Change-Id: I806ec9415b1d2f964f1142f7120cdc212006e140
Reviewed-on: https://review.couchbase.org/c/ns_server/+/172617
Well-Formed: Restriction Checker
Well-Formed: Build Bot <[email protected]>
Reviewed-by: Timofey Barmin <[email protected]>
Tested-by: Artem Stemkovski <[email protected]>

Author: vzasade

src/rebalance_quirks.erl

@@ -24,7 +24,7 @@
 
 %% APIs
 get_quirks(Nodes) ->
-    Config = ns_config:get(),
+    Config = ns_config:latest(),
     OverrideQuirks =
         lists:filtermap(
           fun (Node) ->