Parse mount options with double quotes and commas correctly

[jsafrane]

What type of PR is this?

/kind bug
/sig storage

What this PR does / why we need it:

A mount option can contain commas in a double quoted string. Such comma is part of the mount option and it is not option separator.

For example, this is a single mount option:

  context="system_u:object_r:container_file_t:s0:c460,c902"

Simple strings.Split(..., ",") is not enough here.

Does this PR introduce a user-facing change?

NONE

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

[k8s-ci-robot]

@jsafrane: This issue is currently awaiting triage.

If a SIG or subproject determines this is a relevant issue, they will accept it by applying the triage/accepted label and provide further guidance.

The triage/accepted label can be added by org members by writing /triage accepted in a comment.

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: jsafrane

The full list of commands accepted by this bot can be found here.

The pull request process is described here

Needs approval from an approver in each of these files:

• staging/src/k8s.io/mount-utils/OWNERS [jsafrane]

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment

[jsafrane]

/priority backlog

[gnufied]

/lgtm