Issue #2568203 by phenaproxima, mikeryan: Remove migrate-db.sh in favor of core tools

core/modules/migrate/src/Tests/MigrateTestBase.php

.../modules/migrate_drupal/src/Tests/Dump/DrupalDumpBase.php

...odules/migrate_drupal/src/Tests/MigrateDrupalTestBase.php

...modules/migrate_drupal/src/Tests/MigrateTableDumpTest.php

core/modules/migrate_drupal/src/Tests/Table/d6/Access.php

core/modules/migrate_drupal/src/Tests/Table/d6/Actions.php

.../modules/migrate_drupal/src/Tests/Table/d6/ActionsAid.php

.../migrate_drupal/src/Tests/Table/d6/AggregatorCategory.php

...ules/migrate_drupal/src/Tests/Table/d6/AggregatorFeed.php

...ules/migrate_drupal/src/Tests/Table/d6/AggregatorItem.php

core/modules/migrate_drupal/src/Tests/Table/d6/Authmap.php

core/modules/migrate_drupal/src/Tests/Table/d6/Batch.php

core/modules/migrate_drupal/src/Tests/Table/d6/Blocks.php

...modules/migrate_drupal/src/Tests/Table/d6/BlocksRoles.php

core/modules/migrate_drupal/src/Tests/Table/d6/Book.php

core/modules/migrate_drupal/src/Tests/Table/d6/Boxes.php

core/modules/migrate_drupal/src/Tests/Table/d6/Cache.php

.../modules/migrate_drupal/src/Tests/Table/d6/CacheBlock.php

...ules/migrate_drupal/src/Tests/Table/d6/CacheBootstrap.php

...modules/migrate_drupal/src/Tests/Table/d6/CacheConfig.php