Add NFD master '--instance' flag support to Helm chart

[e0ne]

--instance flag was introduce in the e52ec34 commit.

This patch adds ability to configure it in the Helm chard during deployment.

[k8s-ci-robot]

Hi @e0ne. Thanks for your PR.

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[ArangoGutierrez]

Thanks for this patch @e0ne!
could you add a proper PR description, so it creates a nice git history when merged
Cheers

[e0ne]

@ArangoGutierrez thanks for the feedback. I updated PR description.

[ArangoGutierrez]

/ok-to-test

[ArangoGutierrez]

Patch looks good to me
/lgtm

[marquiz]

Thanks @e0ne ! I haven't tested/verified this myself, but looks good
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: adrianchiris, e0ne, marquiz

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[adrianchiris]

/lgtm