fix multus include (kubernetes-sigs#10105)

``
"msg": "Failed to template loop_control.label: 'ansible.utils.unsafe_proxy.AnsibleUnsafeText object' has no attribute 'item'. 'ansible.utils.unsafe_proxy.AnsibleUnsafeText object' has no attribute 'item'", "skip_reason": "Conditional result was False"}
``
fixes case when multus should NOT be included.

[sysctl] set fs.may_detach_mounts=1 even when CRIs don't set it thems…

…elves (kubernetes-sigs#8635) (kubernetes-sigs#8642)

Simplify usage of pre-remove role (kubernetes-sigs#8334)

- Use builtin task scheduling of ansible (same task on each host)
  instead of manual looping on master

Benefits:
- One less play in remove-node.yml playbook
- Parralel node drain
- Drain parameters (timeout, grace period, retries,
  allow_ungraceful_removal) can be adjusted separately for each node
  with ansible variables

[2.17] Update kubernetes version to 1.21.6 (kubernetes-sigs#8142)

Fix default version (kubernetes-sigs#7977)

Fix Oracle yum disabled repository file after EPEL install (kubernete…

…s-sigs#7639)

remove local lb privileged (kubernetes-sigs#7437) (kubernetes-sigs#7454)

Co-authored-by: Samuel Liu <liupeng0518@gmail.com>

Update kube_version_min_required and cleanup hashes for release (kube…

…rnetes-sigs#7160)

Fix unintended SIGPIPE (kubernetes-sigs#6817)

properly generate extravolumes in kubeadmconfig for centos (kubernete…

…s-sigs#6707)