Merge branch 'fix-role-postgres' into 'master'

Ansible fix pg init command

See merge request !6298

(cherry picked from commit 5b84a9cb)

7a6127e8 fix command noc/system_roles/postgres/tasks/os/CentOS_7/main.yml
69a166d2 change type variable postgres_version for RedHat family
10 jobs for !6300 with cherry-pick-5b84a9cb in 51 minutes and 23 seconds (queued for 5 seconds)
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