Etcd static discovery, even in bootstrap mode, tries to wait for all members to join. Until that systemd unit is in `activating` state which means that task just timeouts waiting for activation. So etcd can not be run in serial. With that we also move etcd installation from zun role to the playbook. As we still want to run playbook for zun installation/configuration in serial mode, having etcd in independent play allows us to do that. This partially reverts commit Ie996262043edb8fb9c7221a5cd98e98a0111ac28 Change-Id: Ic621a7618b99abb56d24e4dcbb52b495c1b39d57
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