Fixes #31307 - Improve compute network error messages

[sbernhard]

Previously, if the connection to the compute resource fails, the
following error message was shown.
Failed to find compute attributes, please check if VM 'xyz' was deleted.

Users are completely confused. With the following change nice error
messages are shown:

Reject:
Receiving vm data for host 'xyz.local' from used compute resource 'VMware' failed: 'Connection to compute resource refused'.

Unreachable:
Receiving vm data for host 'xyz.local' from used compute resource 'VMware' failed: 'Compute resource destination unreachable'.

Timeout:
Receiving vm data for host 'xyz.local' from used compute resource 'VMware' failed: 'Connection to compute resource timed out'.

[theforeman-bot]

Issues: #31307

[sbernhard]

For testing:

# iptables --append OUTPUT --protocol tcp -d 192.168.10.1 --jump  REJECT
# hammer host update --id 9 --parameters t3=t6
Could not update the host:
  Receiving vm data for host 'xyz.local' from used compute resource 'VMware' failed: 'Connection to compute resource refused'.

# iptables --append OUTPUT --protocol tcp -d 192.168.10.1 --jump  REJECT --reject-with icmp-host-unreachable
# hammer host update --id 9 --parameters t3=t6
Could not update the host:
  Receiving vm data for host 'xyz.local' from used compute resource 'VMware' failed: 'Compute resource destination unreachable'.

# iptables --append OUTPUT --protocol tcp -d 192.168.10.1 --jump DROP
# hammer host update --id 9 --parameters t3=t6
Could not update the host:
  Receiving vm data for host 'xyz.local' from used compute resource 'VMware' failed: 'Connection to compute resource timed out'.

[sbernhard]

I don't think that the foreman test issue in 2.7 is related to this change.

[lzap]

I am good, @timogoebel ?

[timogoebel]

@sbernhard: I'm good as well, please make sure the checks are green or else we can't merge.

[ekohl]

On merge we should fix up the commit message to match what I did to the title of this PR. It's just a bit more descriptive.

[sbernhard]

On merge we should fix up the commit message to match what I did to the title of this PR. It's just a bit more descriptive.

done. Thanks @ekohl

[timogoebel]

[test upgrade]

[timogoebel]

@ezr-ondrej: Are you good as well?

[ezr-ondrej]

@ezr-ondrej: Are you good as well?

Yeah, I just didn't see you've already reviewed :)

[timogoebel]

Thanks, everyone! :)

Yeah, I just didn't see you've already reviewed :)

I need to gain some karma points today. :)

[tbrisker]

Cherry pick in GH-8616