mon: osd pool create <pool-name> with --bulk flag

mon: osd pool create <pool-name> with --bulk flag

Creating the pool with `--bulk` will allow
the pg_autoscaler to use the `scale-down`
mode on.

Creating pool:

`ceph osd pool create <pool-name> --bulk`

Get var:

`ceph osd pool get <pool-name> bulk`

Set var:

`ceph osd pool set <pool-name> bulk=true/false/1/0`

Removed `autoscale_profile` and incorporate bulk flag
into calculating `final_pg_target` for each pool.

bin/ceph osd pool autoscale-status no longer has
`PROFILE` column but has `BULK` instead.

Signed-off-by: Kamoltat <ksirivad@redhat.com>