test failures in the narayana-spi module

A recent upgrade to h2 has changed to format of the connection string so we now get the error:

org.h2.jdbc.JdbcSQLNonTransientConnectionException: A file path that is implicitly relative to the current working directory is not allowed in the database URL "jdbc:h2:ceylondb". Use an absolute path, ~/name, ./name, or the baseDir setting instead. [90011-206]

The fix is to go through all of the connection strings to ensure they conform with this change