Fix for OPENDJ-925, OPENDJ-926, and overall schema management. Review CR-1806.
Back a few years ago, when we did the SVR4 package, we split the schema into read-only (Install) and writable (Instance).
With the template model in 2.6, the whole schema is under config, and we should never edit/change the one in the template.
So, I've removed all code related to the 2 locations for schema, reverted some I10N messages to their previous versions, and tidy up code and tests.
All unit-tests are passing.
And it's also possible to change the instance.loc and run setup and have a fully functioning server :-)