Add scheduling op to helm chart

[mochizuki875]

What type of PR is this?

/kind feature

What this PR does / why we need it:

Add ability to change nodeSelector, affinity and tolerations of Pods installed via Helm Chart.

Which issue(s) this PR fixes:

Fixes #696

Special notes for your reviewer:

Does this PR introduce a user-facing change?

Adds ability to change NodeSelector, affinity, and tolerance to Helm Chart.