general: fix race in test setting zone in @show_zones_after_firewalld_install
Recent failures: (master, 30.03.2018) master-upstream-576 (pr#103, 24.04.2018) master-upstream-608
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Recent failures: (master, 30.03.2018) master-upstream-576 (pr#103, 24.04.2018) master-upstream-608