v6.0.16

Changelog:

07813ab tests: remove all references to ceph_stable_release
12f0f71 ceph-defaults: set ceph_stable_release default to the stable branch release
642a83d Add ceph_nfs_adopt tag to the cephadm-adopt playbook
c3fe1a6 cephadm: use cephadm_ssh_user for ssh user
4b5a0c0 cephadm: add admin label on mon nodes
af96456 dashboard: retry setting rgw-credentials
c204166 tests: add osd node in collocation
a4e979d tests: set rgw_instances in collect-logs.yml
7f6cb83 tests: update collect-logs.yml playbook
7ecc85c tests: move collect-logs.yml to ceph-ansible repo
fe617be dashboard: allow disabling of unused features
dbc1972 tests: fix container-cephadm job
d196881 cephadm-adopt: add no_log: true
a053adb adopt: stop iscsi services in the first place
9424200 ceph-dashboard: fix oject gateway integration