Updating the automated tests of the microservice landscape

The automated tests of the microservice landscape, test-em-all.bash, need to be updated so that they ensure that the database of each microservice has a known state before it runs the tests.

The script is extended with a setup function, setupTestdata(), which uses the composite create and delete APIs to set up test data used by the tests.

The setupTestdata function looks like this:

function setupTestdata() {
    body=\
    '{"productId":1,"name":"product 1","weight":1, "recommendations":[
        {"recommendationId":1,"author":"author 
         1","rate":1,"content":"content 1"},
        {"recommendationId":2,"author":"author 
         2","rate":2,"content":"content 2"},
        {"recommendationId":3,"author":"author...