Improve ceph-rgw compatibility with Swift API in Kolla-ansible

By default ceph-rgw is not completely comaptible with Swift API,
because of the restriction for Swift INFO API.[0]

The patch improve ceph-rgw compatibility with Swift API. It is
controlled by the option "ceph_rgw_compatibility" in
ansible/group_vars/all.yml.

After changing the option, run the "reconfigure" command to enable.

Closes-Bug: #1783456

[0] https://github.com/ceph/ceph/pull/17967



Change-Id: Ibf3eb52280e197965caef08a44ae226c4f884cb5
Signed-off-by: tone.zhang <tone.zhang@arm.com>