Cherry-pick to 6.x: Add DeDot in add_docker_metadata processor (elast…

…ic#9505) (elastic#9602)

* Cherry-pick to 6.x: Add DeDot in add_docker_metadata processor (elastic#9505)

* Add DeDot in add_docker_metadata processor

* Add dedot into config and default to be false

* Update changelog and documentation

* Add documentation into processors-using.asciidoc

* Run mage fmt update under x-pack filebeat

* Run mage fmt update on x-pack metricbeat

* Run update again

* Run make update fmt from top level dir

* Remove mistakes from rebase

* Remove repeated doc

(cherry picked from commit 58573a9)

* remove extra line in data.json

journalbeat.reference.yml

@@ -237,6 +237,7 @@ journalbeat.inputs:
 # match_source_index: 4
 # match_short_id: false
 # cleanup_timeout: 60
+# labels.dedot: false
 # # To connect to Docker over TLS you must specify a client and CA certificate.
 # #ssl:
 # # certificate_authority: "/etc/pki/root/ca.pem"