compare configured LO baseIRI with predefined IRI

Addressing Issue #88 (closed)

Changed comparison of predefined IRIs in POST LogisticsObject requests with the baseIRI as defined in application.properties, i.e. . lo-id-config.scheme + lo-id-config.host + lo-id-config.port

In addition, the order of checks in checkIRI has been changed so that the structure of the predefined IRI is checked first and, if valid, a database query is made to check if the predefined IRI already exists.