Display name for GenericContainer

When using regular containers, the image name is usually sufficient for identifying which container given log line is about.
However, when using 2+ GenericContainer instances with same image, it's no longer so:

2020-01-13T13:32:45.298+0100	INFO	testcontainers-lifecycle-2	🐳 [centos:7]	Creating container for image: centos:7
2020-01-13T13:32:45.297+0100	INFO	testcontainers-lifecycle-1	🐳 [centos:7]	Creating container for image: centos:7
2020-01-13T13:32:45.297+0100	INFO	testcontainers-lifecycle-0	🐳 [centos:7]	Creating container for image: centos:7
...
2020-01-13T13:37:46.946+0100	ERROR	testcontainers-lifecycle-1	🐳 [centos:7]	Could not start container
java.lang.IllegalStateException: Container exited with code 1
	at org.testcontainers.containers.GenericContainer.tryStart(GenericContainer.java:457)
	at org.testcontainers.containers.GenericContainer.lambda$doStart$0(GenericContainer.java:317)
	at org.rnorth.ducttape.unreliables.Unreliables.retryUntilSuccess(Unreliables.java:81)
	at org.testcontainers.containers.GenericContainer.doStart(GenericContainer.java:315)
	at org.testcontainers.containers.GenericContainer.start(GenericContainer.java:302)
	at java.util.concurrent.CompletableFuture.uniRun(CompletableFuture.java:705)
	at java.util.concurrent.CompletableFuture$UniRun.tryFire(CompletableFuture.java:687)
	at java.util.concurrent.CompletableFuture$Completion.run(CompletableFuture.java:442)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
	at java.lang.Thread.run(Thread.java:748)

Neither the log line, nor the exception provide information which container failed.

Inizia da GenericContainer.tryStart e GenericContainer.doStart, che compaiono nello stack trace segnalato, e analizza come viene utilizzata l’immagine del container nei messaggi di log del ciclo di vita. Il lavoro è completato quando i log e gli errori di avvio distinguono più istanze di GenericContainer create dalla stessa immagine; aggiungi o aggiorna test mirati per questo comportamento se viene individuata la posizione dei test esistenti.