Fix default behavior for DatabaseResourceAssignmentProcessor
If a data-dictionary did not declare an endpoint-selector, it would
default to primary cds-db instead of using data-dictionary source to
look up database configuration. Processor-db configurations were not
used because of this.
Also improved error messages and some refactoring.
Issue-ID: CCSDK-2315
Signed-off-by: Jozsef Csongvai <jozsef.csongvai@bell.ca>
Change-Id: I7122e1334951db4eec5b9ae8b01c1f66596636f6
(cherry picked from commit
87bf1928aa4772c3b953a0a5800bec99f23b6e9c)