Remove dataspace_id column from Fragment table

- Remove dataspace_id column from fragment table and drop associated
  index, foreign key constraint and uniqueness constaint.
- Add uniqueness constraint using only fragment xpath and anchor_id.
- Add not-null constraint to anchor_id.
- Update code and test data to remove references to dataspace_id.
- Repopulate the dataspace_id in Liquibase rollback
  (verified with manual testing of update/rollback).

Issue-ID: CPS-1677
Signed-off-by: danielhanrahan <daniel.hanrahan@est.tech>
Change-Id: I467cccba25ac5d884ec790064ca58150281b7e1d
diff --git a/cps-ri/src/main/resources/changelog/changelog-master.yaml b/cps-ri/src/main/resources/changelog/changelog-master.yaml
index bf172d8..40e23e2 100644
--- a/cps-ri/src/main/resources/changelog/changelog-master.yaml
+++ b/cps-ri/src/main/resources/changelog/changelog-master.yaml
@@ -52,3 +52,5 @@
       file: changelog/db/changes/17-add-index-to-schema-set-yang-resources.yaml
   - include:
       file: changelog/db/changes/18-cascade-delete-fragment-children.yaml
+  - include:
+      file: changelog/db/changes/19-delete-not-required-dataspace-id-from-fragment.yaml