The existing entrypoint logic used static names to reolve dependencies.
This prevented the service names, and thus the hostnames of services
being altered. This PS resolves that issue by looking up the service name
from the endpoints specified in the values for a chart.
Partial-Implements: blueprint enhance-entrypoint-dependency-checking
External-Tracking-Id: OSH-21
Change-Id: Ib49490f332f8cd88e98c50d9335dfd314a170936