Hotfix wait for startup update

[cdunbar13]

This PR is to fix the wait-for-startup script in the wake of the guest agent being updated. We needed to add a new matching string to account for the new error message, which was introduced about a month ago.

Testing was run by creating a vm-instance with a startup script with various changes:

1. Script that just runs "exit 0"
2. Script that runs "exit 1"
3. Script that slept for longer than the timeout
4. Script that slept and ended before the timeout

Tested on:
Latest hpc-centos-7 image
Latest rocky-8 image
hpc-centos-7-v20220214 - for old agent
rocky-linux-9-v20221102 - for old agent

This issue was introduced by a commit to guest-agent

[tpdownes]

This PR should not be merged until has been manually tested using older releases of the guest-agent.

[tpdownes]

This PR should not be merged until has been manually tested using older releases of the guest-agent.

The offending commit is present in these releases:

• 20231212.00
• 20231118.00
• 20231115.00

[tpdownes]

Further manual testing on old images was successful. I also believe the lustre PR check uses an image before the change in guest-agent.