Add support to set tolerations for ingress-nginx

[beli-sk]

Introduced variable ingress_nginx_tolerations to set custom tolerations for Ingress nginx daemonset, to be able to schedule ingress-nginx on dedicated nodes with taints.

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[beli-sk]

CLA signed

[paolo-de-rosa]

Hi, could you please review the request ?
it would be useful for me too.
thanks.

/assign @mattymo

[chadswen]

ci check this

[chadswen]

/approve
/lgtm

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