Preliminary work to send the site collection via celery, not via the db
Merge branch 'pickle-unpickle' into send-site-collection
Merge branch 'pickle-unpickle' of git://github.com/gem/oq-engine into send-site-collection
Merge branch 'pickle-unpickle' of git://github.com/gem/oq-engine into send-site-collection
Merged from disagg-2
Merge branch 'light-site-collection' into send-site-collection
Changed the signatures of the hazard task to send the site collection via rabbitmq
Merged from master
Fixed a signature
Made sure the site collection is not read from the db
Restored concurrent_tasks = 64
Merge branch 'send-site-collection' of github.com:gem/oq-engine into send-site-collection
Automatic pickling-unpickling of the task arguments
Fixed the pickling-unpickling
Logged how many K of arguments were sent
Merged from disagg-2
Removed some useless test_celery_task
Fixed utils_task_test
Improved logging
Fixed a merge conflict