Preliminary work for Neutron translators.

Factor out OneToOneNeutronApiTranslator, and add framework for adding
translators to NeutronPollingMinion's C3PODataManager instance.

Signed-off-by: Brandon Berg <bberg@midokura.com>
Change-Id: Idebdfcb0d1af6bd02738d571b412ba0f455274dd
Merge "Preliminary work for Neutron translators."