Update tags in all testsuites

All testsuites have been updated with the tags according to what
was agreed in OSM-MR10 and subsequent DevOps calls:

- A tag per testsuite using its mnemonic
- Cluster tag for each of the statistically similar tests:
  - cluster_main
  - cluster_ee_config
  - cluster_relations
  - cluster_epa
  - cluster_k8s
  - cluster_k8s_charms
  - cluster_sa
  - cluster_slices
- daily: for all tests that will run in the daily job
- regression: for all tests that should pass in the current
  stable (same as daily for this release)
- sanity: for all tests that should be passed by each commit in the
  stage3 to be successfully verified by Jenkins

The keywork "Force Tags" has been used to force the tags in all
the tests of a testsuite. In addition, the tag "cleanup" was kept
to those tests doing any deletion.

Change-Id: I3dcb5299a0d0984204ef60cc0450d1b330e6a3d2
Signed-off-by: garciadeblas <gerardo.garciadeblas@telefonica.com>