Weave: add extra_args for weave-npc

[brainfair]

What type of PR is this?

/kind feature

What this PR does / why we need it:

Default Weave-npc logging level is debug. There will be too many logs in a large environment.
We can change this with Extra_Args

Does this PR introduce a user-facing change?:

[Weave] Allow EXTRA_ARGS to be configured for weave-npc, using `weave_npc_extra_args`

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[floryut]

@brainfair Thank you for the PR! Could you please sign CLA ?
/ok-to-test

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: brainfair, floryut

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[jayonlau]

Thanks for your PR!
/lgtm