add integration test for bluechi-is-online agent --monitor

[nsimsolo]

Adding integration test for bluechi-is-online agent --monitor

--monitor keeps monitoring as long as agent is online and exits if it detects an offline state.

1. Start node and agent, keep it running and verify --monitor does not return output.
2. Stop agent and verify --monitor returns 1.

[coveralls]

coverage: 82.251% (+0.02%) from 82.236%
when pulling e54509f on nsimsolo:bluechi-is-online-agent-monitor
into 1cb7527 on eclipse-bluechi:main.

[engelmi]

Small NIT comment, otherwise looks good to me.

[engelmi]

NIT: I think we could check the .result more specifically:

Suggested change

	assert (
	monitor_result_test_two.result is not None
	and monitor_result_test_two.output != ""
	), "Monitor command should produce an output when agent is stopped."
	assert (
	monitor_result_test_two.result == 1
	and monitor_result_test_two.output != ""
	), "Monitor command should produce an output when agent is stopped."

[nsimsolo]

Using 'monitor_result_test_two.result == 1' failed, Based on the test logs, monitor_result_test_two.result is currently captured as False when the agent is offline, rather than the exit code (1).
Also, when I run this test manually the command outputs text and not 1:
~$ sudo bluechi-is-online agent --monitor
org.eclipse.bluechi.Agent is offline
~$ echo $?
1

To make monitor_result_test_two.result == 1 work, we’d need to modify the monitor_agent() function to explicitly return the exit code from the bluechi-is-online command
or use 'monitor_result_test_two.result is False'
but that approach wouldn't align with the other bluechi-is-online tests.
Please Let me know your preference!

[engelmi]

Please remove the merge commit.

[engelmi]

@nsimsolo Please pull the latest changes from main. This should fix the failing pipelines.