(maint) Set crypto-policies to LEGACY in el8 acceptance tests
(maint) Set crypto-policies to LEGACY in el8 acceptance tests

This commit should be reverted once PDB 6.15.1 and PDB 7.2.1 are released.

The upgrade_latest acceptance tests install a version of PDB on el8 which
still needs the crypto-policies workaround until a version of PDB with
an increased ephemeralDHKeySize is released.

puppetlabs/puppetdb,puppetlabs/puppetdb,puppetlabs/puppetdb,puppetlabs/puppetdb,puppetlabs/puppetdb