Fixes #157

Making remote region registry fetch a soft dependency.

This means that clients that are making calls to fetch registry and delta for local region only, will continue to get registry data even if the configured remote region registry is unavailable.
This removes a circular dependency between cross-region eureka instances and hence it is possible to bootstrap both regions from scratch.
Modified the console error message
Merge pull request #158 from NiteshKant/master

Fixes #157