disable actions for readonly users

1.'Update' button in the 'Cluster Settings' page will be
  disabled.

2.OSD actions 'IN', 'OUT', 'DOWN', 'SCRUB' will be disabled.

3.Pool actions 'New', 'Update' and 'Delete' will be disabled.

This is done by looking at the 'Allow' header of the resources.

Fixes: #10072, #10073, #10074
Signed-off-by: Kanagaraj M <kmayilsa@redhat.com>