followup fix for bsc#1108740
followup fix for bsc#1108740

we need to check the admin for `tx_update_reboot_needed`, not the
minions

Signed-off-by: Maximilian Meister <d082c6e85b1479677ce48cb91ac104a594c00930@suse.de>

ereslibre/velum,MaximilianMeister/velum,vitoravelino/velum,vitoravelino/velum,vitoravelino/velum,MaximilianMeister/velum,ereslibre/velum,ereslibre/velum,MaximilianMeister/velum,vitoravelino/velum,kubic-project/velum,MaximilianMeister/velum,kubic-project/velum,ereslibre/velum,kubic-project/velum,kubic-project/velum