util: fix tracevol.py to use namespace argument
util: fix tracevol.py to use namespace argument

tracevol.py accepts namespace argument but doesn't use it currently, fixing the same.

Signed-off-by: Mudit Agarwal <e5356c34e3b3b8ef2f9750bb431df6fcd5e2fa6e@redhat.com>

ceph/ceph-csi,ceph/ceph-csi,ceph/ceph-csi,ceph/ceph-csi