Fix unit test

[imbyungjun]

fixed some unit tests

[imbyungjun]

net.grinder.AgentControllerTest > testAgentControllerServerDaemonRecovery STANDARD_ERROR
    2024-01-09 09:14:56,475 ERROR agent daemon: Exception occurred in the agent message loop
    net.grinder.engine.agent.FileStore$FileStoreException: Could not create directory '/home/runner/work/ngrinder/ngrinder/ngrinder-core/tmp/agent-home/tmp_1/file-store/_default/incoming'
    	at net.grinder.engine.agent.FileStore.<init>(FileStore.java:96) ~[main/:na]
    	at net.grinder.engine.agent.AgentImplementationEx$ConsoleCommunication.<init>(AgentImplementationEx.java:537) ~[main/:na]
    	at net.grinder.engine.agent.AgentImplementationEx.run(AgentImplementationEx.java:163) ~[main/:na]
    	at net.grinder.AgentDaemon$AgentThreadRunnable.run(AgentDaemon.java:131) [main/:na]
    	at java.lang.Thread.run(Thread.java:750) [na:1.8.0_345]
    Caused by: net.grinder.util.Directory$DirectoryException: Could not create directory '/home/runner/work/ngrinder/ngrinder/ngrinder-core/tmp/agent-home/tmp_1/file-store/_default/incoming'
    	at net.grinder.util.Directory.create(Directory.java:105) ~[grinder-core-3.9.1.jar:na]
    	at net.grinder.engine.agent.FileStore.<init>(FileStore.java:92) ~[main/:na]
    	... 4 common frames omitted

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[imbyungjun]

ngrinder/ngrinder-core/src/test/java/org/ngrinder/AbstractMultiGrinderTestBase.java

Lines 40 to 42 in 9e0994c

	static {
	System.setProperty("ngrinder.agent.home", "./tmp/agent-home");
	}

I think that setting ngrinder.agent.home property as ./tmp/agent-home could derive resource contention. I wanted to fix it but no time. I'll change it if there is a next time.

[donggyu04]

How about use private static final Logger LOGGER = LoggerFactory.getLogger(AgentControllerTest.class);?