ConcreteRegistry -> HTTPRegistry

Signed-off-by: Maria Shaldibina <mariash@pivotal.io>
Add FileRegistry for warden infrastructure

Signed-off-by: Maria Shaldibina <mariash@pivotal.io>
Add logger to RegistryProvider

Signed-off-by: Maria Shaldibina <mariash@pivotal.io>
Read InstanceID from FileMetadataService

Signed-off-by: Maria Shaldibina <mariash@pivotal.io>