LU-14637 flr: get rid of excluding dom+flr support test

LU-14637 flr: get rid of excluding dom+flr support test

Now that DoM+FLR are supported, fix the tests that expect this
combination of features on a file to fail.

Fixes: 0bff64be320fd ("LU-9771 flr: to not support dom+flr for phase 1")
Fixes: 44a721b8c1063 ("LU-11421 dom: manual OST-to-DOM migration via mirroring)
Signed-off-by: Bobi Jam <bobijam@whamcloud.com>
Change-Id: I9fc76e797e469744107e5d0453b78729226be0ee
Reviewed-on: https://review.whamcloud.com/44185
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Mike Pershin <mpershin@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>