task failure due to reboot request time out should print off all available logs up to that point

[anonymouse64]

Currently when debugging tests where the system is rebooted and it fails to come back after a reboot, we receive no information about the text execution like we would if the execute section had failed, etc. See for example this failure:

sergio@cachiomachine:~/workspace/snapcore/snapd$ spread external:ubuntu-core-20-64:tests/core/uc20-recovery
2020-10-02 16:04:32 Project content is packed for delivery (4.66MB).
2020-10-02 16:04:32 If killed, discard servers with: spread -reuse-pid=233681 -discard
2020-10-02 16:04:32 Allocating external:ubuntu-core-20-64...
2020-10-02 16:04:32 Waiting for external:ubuntu-core-20-64 to make SSH available at localhost:8022...
2020-10-02 16:04:32 Allocated external:ubuntu-core-20-64.
2020-10-02 16:04:32 Connecting to external:ubuntu-core-20-64...
2020-10-02 16:04:32 Connected to external:ubuntu-core-20-64 at localhost:8022.
2020-10-02 16:04:32 Sending project content to external:ubuntu-core-20-64...
2020-10-02 16:04:33 Preparing external:ubuntu-core-20-64 (external:ubuntu-core-20-64)...
2020-10-02 16:04:33 Preparing external:ubuntu-core-20-64:tests/core/ (external:ubuntu-core-20-64)...
2020-10-02 16:07:20 Preparing external:ubuntu-core-20-64:tests/core/uc20-recovery (external:ubuntu-core-20-64)...
2020-10-02 16:07:22 Executing external:ubuntu-core-20-64:tests/core/uc20-recovery (external:ubuntu-core-20-64) (1/1)...
2020-10-02 16:08:56 Rebooting on external:ubuntu-core-20-64 (external:ubuntu-core-20-64:tests/core/uc20-recovery) as requested...
2020-10-02 16:13:12 Rebooting on external:ubuntu-core-20-64 (external:ubuntu-core-20-64:tests/core/uc20-recovery) as requested...
2020-10-02 16:18:12 WARNING: external:ubuntu-core-20-64 (external:ubuntu-core-20-64:tests/core/uc20-recovery) running late. Current output:
-----
mkdir: cannot create directory ‘/home/gopath’: File exists
sudo: unable to resolve host ubuntu: Temporary failure in name resolution
-----
.
2020-10-02 16:23:12 WARNING: external:ubuntu-core-20-64 (external:ubuntu-core-20-64:tests/core/uc20-recovery) running late. Output unchanged.
2020-10-02 16:28:12 WARNING: external:ubuntu-core-20-64 (external:ubuntu-core-20-64:tests/core/uc20-recovery) running late. Output unchanged.
2020-10-02 16:33:12 WARNING: external:ubuntu-core-20-64 (external:ubuntu-core-20-64:tests/core/uc20-recovery) running late. Output unchanged.
2020-10-02 16:38:12 WARNING: external:ubuntu-core-20-64 (external:ubuntu-core-20-64:tests/core/uc20-recovery) running late. Output unchanged.
2020-10-02 16:43:11 Error executing external:ubuntu-core-20-64:tests/core/uc20-recovery (external:ubuntu-core-20-64) : kill-timeout reached after external:ubuntu-core-20-64 (external:ubuntu-core-20-64:tests/core/uc20-recovery) reboot request
2020-10-02 16:43:11 Error debugging external:ubuntu-core-20-64:tests/core/uc20-recovery (external:ubuntu-core-20-64) : ssh: unexpected packet in response to channel open: <nil>
2020-10-02 16:43:11 Restoring external:ubuntu-core-20-64:tests/core/uc20-recovery (external:ubuntu-core-20-64)...
2020-10-02 16:43:11 Error restoring external:ubuntu-core-20-64:tests/core/uc20-recovery (external:ubuntu-core-20-64) : EOF
2020-10-02 16:43:11 Restoring external:ubuntu-core-20-64:tests/core/ (external:ubuntu-core-20-64)...
2020-10-02 16:43:11 Error restoring external:ubuntu-core-20-64:tests/core/ (external:ubuntu-core-20-64) : EOF
2020-10-02 16:43:11 Restoring external:ubuntu-core-20-64 (external:ubuntu-core-20-64)...
2020-10-02 16:43:11 Error restoring external:ubuntu-core-20-64 (external:ubuntu-core-20-64) : EOF
2020-10-02 16:43:11 Discarding external:ubuntu-core-20-64...
2020-10-02 16:43:11 Successful tasks: 0
2020-10-02 16:43:11 Aborted tasks: 0
2020-10-02 16:43:11 Failed tasks: 1
    - external:ubuntu-core-20-64:tests/core/uc20-recovery
2020-10-02 16:43:11 Failed task restore: 1
    - external:ubuntu-core-20-64:tests/core/uc20-recovery
2020-10-02 16:43:11 Failed suite restore: 1
    - external:ubuntu-core-20-64:tests/core/
2020-10-02 16:43:11 Failed project restore: 1
    - external:ubuntu-core-20-64:project
error: unsuccessful run

The only information we get is the "is taking too long Current Output" message which is not enough information, and additionally the debug section is not executed.