Revert "CI: temporarily disable CentOS/AArch64 testing"
Revert "CI: temporarily disable CentOS/AArch64 testing"

This reverts commit 5cc3bafc2c46c7b431284199b600f70c4f1c13a7.

Reason for revert: Issue got fixed in CentOS.

Change-Id: Id6df7a0b8c065d886a555bfa0f71155a8c0660a2

stackforge/kolla,stackforge/kolla,openstack/kolla,stackforge/kolla,openstack/kolla