Fix for bloodhound relations configuration not being set on upgrade from a pre-0.6.0 version. Refs #630.

Default `bhrelations` configuration is now specified through the option default values, rather than in `bloodhound_setup`. Default `bhrelations_links` configuration is now written when upgrading the environment if a `bhrelations_links` configuration section doesn't already exist.


git-svn-id: https://svn.apache.org/repos/asf/bloodhound/trunk@1515299 13f79535-47bb-0310-9956-ffa450edef68