The awk helper responsible for extracting IP addresses from the resolvectl
call could handle only 2 of them.
It turns out that api.openshift.com now has 4 A records, therefore this method
became flakey: It added only 2 addresses to the IP set, so if the osbuild
plugin used one of the 2 ignored addresses, the call failed.
This commit solves it by introducing a different method of parsing the
resolvectl output:
We now use an ugly but working sed command that erases everything from the
line except for the IPv4 address. Therefore, I had to quote the echo before
the new sed command so it can get a proper multiline input. Also, I limited
resolvectl to just use IPv4 because the new script cannot handle IPv6
properly. This doesn't cause any harm because api.openshift.com isn't
actually accessible by IPv6. Sigh...
6ba8b69e3e