poolmanager: fix wrandom partition #7898
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Motivation:
the merge of commit a778f97 added silent conflict which introduced infinite loop due to loop index freez, that ended in infinite loop.
Modification:
fix the loop using iterator and index (as original code aimed to to). Added extra unit test that check loop in action.
Result:
fixed infinite loop in wrandom partition
Acked-by: Dmitry Litvintsev
Target: master, 11.1, 11.0, 10.2, 10.1, 10.0, 9.2
Require-book: no
Require-notes: yes
(cherry picked from commit cd23f59)