NewReplicationManager creates a new ReplicationManager.

Realistic value of the burstReplica field for the replication manager based off performance requirements for kubernetes 1.0.

We'll attempt to recompute the required replicas of all replication controllers the have fulfilled their expectations at least this often.

If a watch misdelivers info about a pod, it'll take at least this long to rectify the number of replicas.

We must avoid counting pods until the pod store has synced.

ReplicationManager is responsible for synchronizing ReplicationController objects stored in the system with actual running pods.