Add missing release namespace for manila charts

[mnaser]

The manila charts are missing the namespace and when templating
things with Helm, it will omit it and be problematic. The cinder
chart has the namespaces set everywhere and its better to be
explicit so this adds it to the manila chart.

What this PR does / why we need it:

Which issue this PR fixes(if applicable):
fixes #

Special notes for reviewers:

Release note:

NONE

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[k8s-ci-robot]

Hi @mnaser. Thanks for your PR.

I'm waiting for a kubernetes member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[gouthampacha]

/ok-to-test

@mnaser needs a version bump on https://github.com/kubernetes/cloud-provider-openstack/blob/master/charts/manila-csi-plugin/Chart.yaml#L5

[k8s-ci-robot]

@mnaser: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
pull-cloud-provider-openstack-check	88885e4	link	true	/test pull-cloud-provider-openstack-check

Full PR test history. Your PR dashboard. Please help us cut down on flakes by linking to an open issue when you hit one in your PR.

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[mnaser]

closing in favour of my coworkers #2889 :)