Automatic merge from submit-queue

Scheduler configurator looks for a specific key in ConfigMap.Data

**What this PR does / why we need it**: Changes scheduler configurator to look for a specific key in ConfigMap.Data instead of the old logic which expected only one entry to exist in the map. The key is a constant whose value is "policy.cfg".

**Which issue this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close that issue when PR gets merged)*: fixes #

**Special notes for your reviewer**:

**Release note**:

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