CSPACE-6329: Remove two, now-obsolete Nuxeo per-repository config files. These files are now generated, in part via the build process and in part during server startup, from a prototype config file.
CSPACE-6168: By default, the CollectionSpace instance ID value in build.properties is to be blank, to replicate previous behavior before instance qualification was added. Also added comments to build.properties describing the use of, and convention for, this value.