[BUG] crc commands backed by daemon will fail on systems with no systemd user instance support

[adrianriobo]

crc daemon on linux platforms is installed based on systemd user instance, as so there is a requirement to support it in order to crc setup to handle the crc daemon installation.

If the daemon can not be installed any command backed only by the daemon will not work:

As an example RHEL 7.9 does not support it, and current implementation for crc status requires it...as so on a normal flow we can:

1. crc setup
2. crc start
3. crc status

Expected

Get the state of the cluster

Actual

Get an error complaining about crc setup not run properly

[cfergeau]

Now that RHEL9 has been released, do we want to keep supporting RHEL7? Using oc with RHEL7 has been deprecated with OpenShift 4.10 ( openshift/openshift-docs#47959 ), in my opinion it's time we stop supporting it.

[adrianriobo]

Yeah that is one part of the discussion, also not aware which other edge cases for systems not supporting systemd user instance we can face @praveenkumar mention ubuntu?...although we do not officially support it

[praveenkumar]

@adrianriobo yes ubuntu is not officially supported and in our support matrix we should remove 7.x now since latest 2 ( 8 and 9) should be good enough.