Last-minute fix for v1.5.1

 - Fix the database view 'DifferentFrequencies'  of 'integers_db/1'
 - Fix the path used by the CI to execute the tests
 - Fix the version of the docker images needed
1 job for v1.5.1 in 15 minutes and 4 seconds (queued for 5 seconds)
latest
Status Job ID Name Coverage
  Build
failed #99680
docker-build
build

00:15:04

 
Name Stage Failure
failed
build Build There is an unknown failure, please try again
  File "/home/gitlab-runner/builds/0d638152/0/beat/beat.core/beat/core/test/test_worker.py", line 286, in wait_for_worker_disconnection
self.assertTrue(time() - start < 10) # Exit after 10 seconds
AssertionError: False is not true

----------------------------------------------------------------------
Ran 500 tests in 846.638s

FAILED (failures=1)
ERROR: Job failed: exit status 1