Use kubespray-defaults in remove-node role

[Timoses]

What type of PR is this?

Uncomment only one /kind <> line, hit enter to put that in a new line, and remove leading whitespaces from that line:

/kind api-change
/kind bug
/kind cleanup
/kind design
/kind documentation
/kind failing-test
/kind feature
/kind flake

What this PR does / why we need it:
Without this PR the playbook remove-node is unable to execute the tasks in roles/remove-node/{pre/post}-remove/tasks/main.yml as bin_dir is undefined.

TASK [remove-node/pre-remove : cordon-node | Mark all nodes as unschedulable before drain] ***************************************************
task path: /home/funke_t1/code/ansible/ansible/plays/kubernetes/kubespray/roles/remove-node/pre-remove/tasks/main.yml:2
fatal: [kubernetes-dev-6.mgmt.hss.int]: FAILED! => {"msg": "The task includes an option with an undefined variable. The error was: 'bin_dir' is undefined\n\nThe error appears to be in '/home/funke_t1/code/ansible/ansible/plays/kubernetes/kubespray/roles/remove-node/pre-remove/tasks
/main.yml': line 2, column 3, but may\nbe elsewhere in the file depending on the exact syntax problem.\n\nThe offending line appears to be:\n\n---\n- name: cordon-node | Mark all nodes as unschedulable before drain\n  ^ here\n"}
...ignoring

TASK [remove-node/pre-remove : remove-node | Drain node except daemonsets resource] **********************************************************
task path: /home/funke_t1/code/ansible/ansible/plays/kubernetes/kubespray/roles/remove-node/pre-remove/tasks/main.yml:12
fatal: [kubernetes-dev-6.mgmt.hss.int]: FAILED! => {"msg": "The task includes an option with an undefined variable. The error was: 'bin_dir' is undefined\n\nThe error appears to be in '/home/funke_t1/code/ansible/ansible/plays/kubernetes/kubespray/roles/remove-node/pre-remove/tasks
/main.yml': line 12, column 3, but may\nbe elsewhere in the file depending on the exact syntax problem.\n\nThe offending line appears to be:\n\n\n- name: remove-node | Drain node except daemonsets resource\n  ^ here\n"}
...ignoring

TASK [remove-node/post-remove : Delete node] *************************************************************************************************
task path: /home/funke_t1/code/ansible/ansible/plays/kubernetes/kubespray/roles/remove-node/post-remove/tasks/main.yml:3
fatal: [kubernetes-dev-6.mgmt.hss.int]: FAILED! => {"msg": "The task includes an option with an undefined variable. The error was: 'bin_dir' is undefined\n\nThe error appears to be in '/home/funke_t1/code/ansible/ansible/plays/kubernetes/kubespray/roles/remove-node/post-remove/tasks/main.yml': line 3, column 3, but may\nbe elsewhere in the file depending on the exact syntax problem.\n\nThe offending line appears to be:\n\n\n- name: Delete node\n  ^ here\n"}
...ignoring

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:
Tested remove-node.yml playbook with the changes and it successfully runs with correct bin_dir specified.

Does this PR introduce a user-facing change?:

NONE

[riverzhang]

ci check this
/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: riverzhang, Timoses

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