Fix race condition and arena tracking bug

[antoniofilipovic]

Fixes issue on query not being tracked due to issue with jemalloc mallctl call to thread.arena which can give different arena in different times of calling.

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[antoniofilipovic]

Fixes issue: #1469

[antoniofilipovic]

@vpavicic RN: fix race condition on MEMORY QUERY LIMIT queries, where query memory limit was not sometimes respected