Chooser: Unify the caching of the original bindings
Chooser: Unify the caching of the original bindings

Unifiy the store of initial service bindings between HostChooser and
ClusterChooser.

Change-Id: I6faeddb2ac124b598461106b2606d55a7c8fbcc7
Reviewed-by: Zoltan Sebestyen <be2314d0afde2d2352aeb623a228e572c9b6cb8b@morganstanley.com>

quattor/aquilon,guillaume-philippon/aquilon,guillaume-philippon/aquilon,quattor/aquilon,guillaume-philippon/aquilon,quattor/aquilon