Change scope for EffectivePolicyImpl.initilise() and EndpointPolicyImpl.initilise() to more permissive

Hi,

All initilize() methods in EffectivePolicyImpl and EndpointPolicyImpl are package private.
Unfortunatelly it prevents reusing of these classes in custom use cases.

Proposal: change method's scope to protected or public.

Patch with public alternative is attached.

Regards,
Andrei.