Helm chart init container support

[alice-sawatzky]

/kind feature

Add the ability to add init containers via the helm chart, in order to implement the recommendations in these issues:

• Local block devices as a volume source, with partitioning and fs formatting #173
• Consider adding SPDK support #167
• Consider support for RAID in local provisioner #65

Release note:

The `daemonset.initContainer` value has been added to the Helm chart, as well as a `daemonset.additonalHostPathVolumes` to add any additional host path volumes the init containers may need.

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[k8s-ci-robot]

Hi @alice-sawatzky. Thanks for your PR.

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[msau42]

/ok-to-test

[cofyc]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: alice-sawatzky, cofyc

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[cofyc]

please run hack/update-generated.sh to update generated examples

[alice-sawatzky]

/retest

[cofyc]

/lgtm