Allow deploy OCP with two master node

[danpawlik]

That commit allows to deploy OCP with two masters node. It would be useful for environments with limited resources.

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[danpawlik]

taken from https://github.com/openshift-metal3/dev-scripts/blob/master/agent/docs/config-presets-and-options.md - that SNO is possible.

[hjensas]

@danpawlik interresting! Did you test it?
I think for this to work we also need to change the make target executed to the agent[1] target in roles/devscripts/tasks/main.yml

[1] https://github.com/openshift-metal3/dev-scripts/blob/master/Makefile#L10C1-L10C6

[softwarefactory-project-zuul]

Merge Failed.

This change or one of its cross-repo dependencies was unable to be automatically merged with the current state of its repository. Please rebase the change and upload a new patchset.

[danpawlik]

@hjensas so far, it does not work and don't know why (the SNO). It is like the metal3 does not support SNO (looking in theirs script, it is like the "feature" is not present there). I moved the changes to other PR #3129. I was hoping that the metal3 is more less using - https://docs.redhat.com/en/documentation/openshift_container_platform/4.18/html/installing_on_a_single_node/install-sno-installing-sno#install-sno-installing-sno-manually manual, but seems not.
I don't give up yet ;) maybe we can consider other way https://docs.redhat.com/en/documentation/openshift_container_platform/4.18/html/installing_on_a_single_node/install-sno-installing-sno#install-booting-from-an-iso-over-http-redfish_install-sno-installing-sno-with-the-assisted-installer ?

[hjensas]

@hjensas so far, it does not work and don't know why (the SNO). It is like the metal3 does not support SNO (looking in theirs script, it is like the "feature" is not present there). I moved the changes to other PR #3129. I was hoping that the metal3 is more less using - https://docs.redhat.com/en/documentation/openshift_container_platform/4.18/html/installing_on_a_single_node/install-sno-installing-sno#install-sno-installing-sno-manually manual, but seems not. I don't give up yet ;) maybe we can consider other way https://docs.redhat.com/en/documentation/openshift_container_platform/4.18/html/installing_on_a_single_node/install-sno-installing-sno#install-booting-from-an-iso-over-http-redfish_install-sno-installing-sno-with-the-assisted-installer ?

I'll take a look this weekend, probably start off with the agent based installer role from hotstack - but change it to use an ISO instead of network boot. It would be similar to what that last link suggest.