[WIP]e2e placement policy with other scheduler plugins

[helayoty]

Fixes #29

[helayoty]

Currently I'm getting the following error

Error occurred" err="Pod pp-ns-1e465fc37f/statefulset-test-3 is already present in the active queue" pp-plugins-scheduler I0111 01:10:28.794307 1 placementpolicy.go:137] "annotating pod" pod="statefulset-test-3" plugin="prefilter" pp-plugins-scheduler I0111 01:10:28.802879 1 placementpolicy.go:240] "annotating pod" pod="statefulset-test-3" plugin="prefilter" pp-plugins-scheduler E0111 01:10:28.809606 1 scheduler.go:558] "Error selecting node for pod" err="running PreScore plugin \"placementpolicy\": failed to annotate pod : Operation cannot be fulfilled on pods \"statefulset-test-3\": the object has been modified; please apply your changes to the latest version and try again" pod="pp-ns-1e465fc37f/statefulset-test-3" pp-plugins-scheduler E0111 01:10:28.809668 1 factory.go:397] "Error scheduling pod; retrying" err="running PreScore plugin \"placementpolicy\": failed to annotate pod : Operation cannot be fulfilled on pods \"statefulset-test-3\": the object has been modified; please apply your changes to the latest version and try again" pod="pp-ns-1e465fc37f/statefulset-test-3" pp-plugins-scheduler E0111 01:10:28.809753 1 factory.go:417] "Error occurred" err="Pod pp-ns-1e465fc37f/statefulset-test-3 is already present in the active queue"