This commit is a huge refactoring of how we handle network policies. In
* KuryrNetPolicy is replaced by KuryrNetworkPolicy. The upgrade path
is handled in the constructor of KuryrNetworkPolicyHandler.
* New CRD has spec and status properties. spec is always populated by
NetworkPolicyHandler. status is handled by KuryrNetworkPolicyHandler.
This means that in order to trigger SG rules recalculation on Pod ang
Service events, the NetworkPolicy is "bumped" with a dummy annotation.
* NetworkPolicyHandler injects finalizers onto NetworkPolicy and
KuryrNetworkPolicy objects, so that objects cannot get removed before
KuryrNetworkPolicyHandler won't process deletion correctly.