[18.0.0-proposed] [Uni02Beta] Install conntrack on EDPM nodes

[openshift-cherrypick-robot]

This is an automated cherry-pick of #395

/assign eduolivares

[abays]

Does this need to be tested somewhere or can we merge it since the parent PR is already merged?

[eduolivares]

Does this need to be tested somewhere or can we merge it since the parent PR is already merged?

I'd say the fact the parent PR was tested and worked well makes merging this cherry-pick safe enough.
We need it into 18.0 branch because we want to use it in our d/s CI.

[abays]

/lgtm
/approve

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[softwarefactory-project-zuul]

Build succeeded (gate pipeline).
https://softwarefactory-project.io/zuul/t/rdoproject.org/buildset/8ef2d5a5f49a4fb3875efc8cd55da7dd

✔️ noop SUCCESS in 0s
✔️ rhoso-architecture-validate-uni02beta SUCCESS in 3m 46s