Fix gcbrun trigger

[DonggeLiu]

Fixes #1897

[DonggeLiu]

/gcbrun run_experiment.py -a --experiment-config /opt/fuzzbench/service/experiment-config.yaml --experiment-name 2023-09-06-fix-gcb --fuzzers afl --benchmark libxml2_xml

[DonggeLiu]

Testing launching exp with the comment above, will test some other cases once it launches successfully.

[DonggeLiu]

Experiment 2023-09-06-fix-gcb data and results will be available later at:
The experiment data.
The experiment report.

[DonggeLiu]

/gcbrun run_experiment.py -a --experiment-config /opt/fuzzbench/service/experiment-config.yaml --experiment-name 2023-09-06-fix-gcb --fuzzers afl --benchmark libxml2_xml

This comment should not trigger any experiment now.

[DonggeLiu]

This comment should not trigger any experiment now.

The comment still triggers the GCB, but did not attempt to start an experiment because of this fix. It returns None and prints 'Experiment not requested.'.
This is better than what we had (which attempts to start an experiment), but it is still not optimal because it will intercept the previous experiment request and overwrite the GCB log below)

It would be great if we could simply ignore the GCB command, but that is controlled by GCB trigger, not our script.

[DonggeLiu]

/gcbrun run_experiment.py -a --experiment-config /opt/fuzzbench/service/experiment-config.yaml --experiment-name 2023-09-06-fix-gcb-1 --fuzzers afl --benchmark libxml2_xml

[DonggeLiu]

Experiment 2023-09-06-fix-gcb-1 data and results will be available later at:
The experiment data.
The experiment report.

[DonggeLiu]

/gcbrun run_experiment.py -a --experiment-config /opt/fuzzbench/service/experiment-config.yaml --experiment-name 2023-09-06-fix-gcb-2 --fuzzers afl --benchmark libxml2_xml

[DonggeLiu]

Experiment 2023-09-06-fix-gcb-2 data and results will be available later at:
The experiment data.
The experiment report.

[DonggeLiu]

/gcbrun run_experiment.py -a --experiment-config /opt/fuzzbench/service/experiment-config.yaml --experiment-name 2023-09-06-fix-gcb-2 --fuzzers afl --benchmark libxml2_xml

[DonggeLiu]

/gcbrun run_experiment.py -a --experiment-config /opt/fuzzbench/service/experiment-config.yaml --experiment-name 2023-09-06-fix-gcb-2 --fuzzers afl --benchmark libxml2_xml

[DonggeLiu]

/gcbrun run_experiment.py -a --experiment-config /opt/fuzzbench/service/experiment-config.yaml --experiment-name 2023-09-06-fix-gcb-2 --fuzzers afl --benchmark libxml2_xml

This should not start an exp.

[jonathanmetzman]

lgtm