Make worker-count of controller-manager and master-controller configurable

[bashofmann]

What this PR does / why we need it:
Make worker-count of controller-manager and master-controller configurable in helm chart

A higher worker count can speed up the controllers, especially the rbac controller significantly in larger installations

Does this PR introduce a user-facing change?:

The worker-count of controller-manager and master-controller are now configurable

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[alvaroaleman]

/lgtm
/approve
CC @floreks @xrstf

[kubermatic-bot]

LGTM label has been added.

Git tree hash: 1f259b309693ff9c35507fffc188014ac1d89a2e

[kubermatic-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: alvaroaleman

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