Meta server: remove unnecessary and potentially harmful permission check optimization with append allocations. One problem with is that the -EPERM returned by AllocateChunkForAppend() can potentially clash with -1 returned in other cases. The other problem is that the cached permissions in the record append cache can become stale / out of date. On the other hand this optimization has practically no benefit as it only affects the "permissions denied" case, and has no effect on the successful allocations.
Merge branch 'master' into topic/tiered_storage