Comment 1 for bug 1563643

Checking the fix condition first in the when clause rather than the
    dynamic condition. Otherwise it will raise issue, especially in
    multinode env.

    For example use

      when:
        - nova_console == 'novnc'
        - inventory_hostname in groups['nova-novncproxy']

    rather than

      when:
        - inventory_hostname in groups['nova-novncproxy']
        - nova_console == 'novnc'

    Because the nova-novncproxy groups may do not exist.