Fix the nova reconfigure in the multinode env

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