cleanup /etc/csi-tool

[huww98]

What type of PR is this?

/kind cleanup

What this PR does / why we need it:

/etc is for config files, and is not suitable for socket, rpm package...

connector: use runtime directory for socket

Also includes some cleanups, see commits.

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?

NONE

Additional documentation e.g., KEPs (Kubernetes Enhancement Proposals), usage docs, etc.:

[k8s-ci-robot]

Hi @huww98. Thanks for your PR.

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[huww98]

Two level of directory is required, because the inner one will be removed by systemd when the service is stopped/restarted. If we only have single level, the directory re-created on host and the one mounted into container will be different.

[mowangdk]

/ok-to-test

[mowangdk]

/lgtm

@tydra-wang ptal~

[mowangdk]

/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: huww98, mowangdk

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