jailkit: update jail if /bin/bash does not function

This tests if /bin/bash within a jail is functioning and forces a jail update if not.

Of the various jailkit updates that required forcing an update, most (if not all) noticed /bin/bash not functioning as the presenting symptom.

added MR: Review Pending label

changed milestone to %3.2.2

resolved all threads

merged

mentioned in commit 7f119a6f

removed MR: Review Pending label