Allow Namespace Override for seldon-core-operator

[ntorba]

What this PR does / why we need it:
This PR allows for users to override the namespace that the seldon-core-operator helm chart is installed into.
This is useful because when the helm chart is used as a dependency to other helm charts, you may not want it to be installed in the release namespace of the helm chart for which it is a dependency. Without this namespace override option, that is not possible.
Which issue(s) this PR fixes:

Fixes #2676

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

Added support for namespace override in values of seldon-core-operator helm chart.

[seldondev]

Hi @ntorba. Thanks for your PR.

I'm waiting for a SeldonIO 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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[ntorba]

/assign @RafalSkolasinski

[ukclivecox]

/ok-to-test

[ukclivecox]

/test integration

[ukclivecox]

/test notebooks

[seldondev]

Mon Jan 4 15:53:23 UTC 2021
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Mon Jan 4 15:53:30 UTC 2021
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Mon Jan 4 15:53:33 UTC 2021
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Mon Jan 4 15:53:45 UTC 2021
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[ukclivecox]

/approve

[seldondev]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: cliveseldon

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[seldondev]

Mon Jan 11 18:54:52 UTC 2021
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Mon Jan 11 18:55:03 UTC 2021
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Mon Jan 11 19:07:47 UTC 2021
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Mon Jan 11 19:07:59 UTC 2021
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