Always create bash_completion.d folder

[praseodym]

What type of PR is this?

/kind bug

What this PR does / why we need it:

This PR fixes a fatal error when installing kubectl with the containerd container engine on Ubuntu 18.04:

TASK [kubernetes/master : Install kubectl bash completion]
task path: /home/mark/git/kubernetes-sigs/kubespray/roles/kubernetes/master/tasks/main.yml:54
fatal: [k8s-master]: FAILED! => {"changed": true, "cmd": "/usr/local/bin/kubectl completion bash >/etc/bash_completion.d/kubectl.sh", "delta": "0:00:00.002043", "end": "2019-08-03 20:54:10.686498", "msg": "non-zero return code", "rc": 2, "start": "2019-08-03 20:54:10.684455", "stderr": "/bin/sh: 1: cannot create /etc/bash_completion.d/kubectl.sh: Directory nonexistent", "stderr_lines": ["/bin/sh: 1: cannot create /etc/bash_completion.d/kubectl.sh: Directory nonexistent"], "stdout": "", "stdout_lines": []}

When the Docker container engine is used, the docker-ce package has Recommends: git which installs /etc/bash_completion.d/git-prompt and thus ensures the directory exists before this task is called.

This PR also fixes the following ignored error during crictl installation:

TASK [container-engine/containerd : Install crictl completion]
task path: /home/mark/git/kubernetes-sigs/kubespray/roles/container-engine/containerd/tasks/main.yml:129
fatal: [k8s-master]: FAILED! => {"changed": true, "cmd": "/usr/local/bin/crictl completion >/etc/bash_completion.d/crictl", "delta": "0:00:00.001735", "end": "2019-08-03 21:05:42.075376", "msg": "non-zero return code", "rc": 2, "start": "2019-08-03 21:05:42.073641", "stderr": "/bin/sh: 1: cannot create /etc/bash_completion.d/crictl: Directory nonexistent", "stderr_lines": ["/bin/sh: 1: cannot create /etc/bash_completion.d/crictl: Directory nonexistent"], "stdout": "", "stdout_lines": []}
...ignoring

Does this PR introduce a user-facing change?:

Always create bash_completion.d folder

[praseodym]

/assign @Atoms

[Atoms]

ci check this

[Atoms]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: Atoms, praseodym

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