fix reading preshared keys

[tomjelinek]

lookup('file') does not work with binary files and causes failures depending on the content of a preshared key file

[tomjelinek]

centos-8 is expected to fail, a fix for that is in #11

[richm]

@tomjelinek any ideas why we're getting the rhel-8-y failures?

TASK [linux-system-roles.ha_cluster : Install cluster packages] ****************
task path: /tmp/tmp98asuavs/tasks/install-and-configure-packages.yml:30
fatal: [/cache/rhel-8-y.qcow2]: FAILED! => {"changed": false, "failures": [], "msg": "
Depsolve Error occured:
Problem 1: conflicting requests
  - nothing provides corosynclib(x86-64) = 3.1.0-4.el8 needed by corosync-3.1.0-4.el8.x86_64
Problem 2: package pacemaker-2.0.5-9.el8.x86_64 requires corosync >= 2.0.0, but none of the providers can be installed
  - conflicting requests
  - nothing provides corosynclib(x86-64) = 3.1.0-4.el8 needed by corosync-3.1.0-4.el8.x86_64
", "rc": 1, "results": []}

We're using the nightly/latest-RHEL-8/compose/HighAvailability repo.

[tomjelinek]

Several cluster components (including corosync) are split into multiple rpms. Some of those rpms go to rhel-appstream repo, while the others go to rhel-HighAvailability. Therefore, these two repos must point to the same release. If rhel-appstream is 'latest-RHEL-8.4', then rhel-HighAvailability must be 'latest-RHEL-8.4' as well.

[jharuda]

[citest bad]

[richm]

[citest pending]

[jharuda]

[citest pending]

[jharuda]

[citest pending]

[tomjelinek]

[citest bad]

[richm]

[citest pending]

[richm]

[citest bad]

[richm]

[citest pending]