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.

Change-Id: I1e76ee239908a17a4c2ffd9a18c570fbc485172e
Closes-Bug: #1563643