Version comparision for RedHat based distributions

[wojciech-kopras]

In file tasks/persist-redhat.yml to compare version number it's better to use filter |int >= 7 and |int < 7 - then the comparision will work correctly also for versions bigger than 9. This change will make this role working properly also on Fedora 28 servers - as it happened to me..

It's mentioned here:

Tip: Sometimes you’ll get back a variable that’s a string and you’ll want to do a math operation comparison on it. You can do this like so:

tasks:

• shell: echo "only on Red Hat 6, derivatives, and later"
  when: ansible_facts['os_family'] == "RedHat" and ansible_facts['lsb']['major_release']|int >= 6