Task #10079: another manual merge (manual file copy) from https://svn.astron.nl/LOFAR/branches/adder-Task10079

SW-401: qa_service has items in the queue by design, so there is no need to indicate orange/red colors when there are a few items in the queue

SW-401: merged new QA_Service developments from trunk, which came via a manual merge (manual file copy) from https://svn.astron.nl/LOFAR/branches/adder-Task10079

SW-463: Removed dysco as a default storage manager from the generated xml. This will be handled by OTB

SW-459: Fixed a test that was calling coverage in a way that is incompatible with the version on the buildhost centos7

SW-455: Merged LOFAR-Releas-3_1 back to trunk so all fixed there are in trunk ready for the 3.2 Release

ROHD-1124: during the rollout of LOFAR-Release-3_1_6 we replaced the radb trigger functions in production with the new functions in SAS/ResourceAssignment/ResourceAssignmentDatabase/radb/sql/add_functions_and_triggers.sql from svn. We forgot that these functions in production had a check to ignore cep4 storage resource, causing problems in scheduling. With this changeset, we (again) ignore cep4 storage claims if they fit. Also added a comment on ideas for faster/better/simpler filling the resource_sage table.

SW-448: merge back from https://svn.astron.nl/LOFAR/branches/SW-448-robinhood-bugfix. Use normal du for now instead of robinhood-du. Easy switch back to rbh-du in october possible. Made queries and scans faster.