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Fix policy conflict in the CPU manager node e2e test.

**What this PR does / why we need it**:
After graduation of the CPU manager feature to Beta, the CPU manager `none` policy is ON by default. But when the CPU manager is set to use `static` policy in the node e2e test, there will always be a conflict with the policy checkpointed in the disk. This PR fixes that by deleting the state file where required. 

Manually tested in an `n1-standard-4` instance with `Ubuntu 16.04` image on GCP, which is the same machine and image type as one of the configs used in the node e2e tests. 

Use the following command to run the test locally:
`make test-e2e-node TEST_ARGS='--feature-gates=DynamicKubeletConfig=true' FOCUS="CPU Manager" SKIP="" PARALLELISM=1`

CC @ConnorDoyle @derekwaynecarr