Fix Audit functional tests

The issue to fix on Audit ftests was related to the deployment of NBM on Nuxeo:

• The audit.elasticsearch.enabled=true prevents us to override this variable in the nuxeo.conf
• The query was declared for either h2 or mongodb

Solution:

• Declare the audit page provider for ES instead of h2 in NBM
• It's overriden already in the cloud template for mongodb
• Test the page provider for h2 to avoid unecessary unit test for ES.