Fix InMemoryDBIntegrationTest Unit Test

In class InMemoryDBIntegrationTest all tests fail. A common error between all failing tests is the error Error executing DDL "create table <db_table_name>" via JDBC [Syntax error in SQL statement "create table <db_table_name>...], org.hibernate.tool.schema.spi.CommandAcceptanceException: Error executing DDL. Investigate why it fails (is it due to wrong assertion declaration or due to breaking changes in the main code?) and fix it.

Problem seems similar with org.etsi.osl.oas->Issues->#4. If it is solved, use it as a guide.

After fixing the SQL related problem still some tests fail due to wrong assertions. Need to invstigate if it is wrong assertion due to wrong test or due to wrong main code.