Enable to mount host folders to broker container

[chia7712]

允許使用者將host folders掛載給broker containers，如此可達到下列兩個效果

1. 保存資料
2. 同時使用多顆硬碟作為資料存取

[chia7712]

@qoo332001 麻煩協助測試，謝謝

[qoo332001]

@chia7712 在使用docker創建broker的時候在local可以在指定的log.dir生成log folders,但這些folders的存取權限是只有root才能使用，所以會導致沒辦法在裡面放log檔
執行指令如下:

env LOG_FOLDERS=/home/sean/Documents/log1,/home/sean/Documents/log2,/home/sean/Documents/log3 ./docker/start_broker.sh zookeeper.connect=192.168.103.39:16878

其錯誤訊息如下:

[2021-11-26 09:17:07,951] ERROR Disk error while locking directory /tmp/kafka-logs1 (kafka.server.LogDirFailureChannel)
java.nio.file.AccessDeniedException: /tmp/kafka-logs1/.lock
	at java.base/sun.nio.fs.UnixException.translateToIOException(UnixException.java:90)
	at java.base/sun.nio.fs.UnixException.rethrowAsIOException(UnixException.java:111)
	at java.base/sun.nio.fs.UnixException.rethrowAsIOException(UnixException.java:116)
	at java.base/sun.nio.fs.UnixFileSystemProvider.newFileChannel(UnixFileSystemProvider.java:182)
	at java.base/java.nio.channels.FileChannel.open(FileChannel.java:292)
	at java.base/java.nio.channels.FileChannel.open(FileChannel.java:345)
	at kafka.utils.FileLock.<init>(FileLock.scala:31)
	at kafka.log.LogManager.$anonfun$lockLogDirs$1(LogManager.scala:231)
	at scala.collection.StrictOptimizedIterableOps.flatMap(StrictOptimizedIterableOps.scala:117)
	at scala.collection.StrictOptimizedIterableOps.flatMap$(StrictOptimizedIterableOps.scala:104)
	at scala.collection.mutable.ArraySeq.flatMap(ArraySeq.scala:37)
	at kafka.log.LogManager.lockLogDirs(LogManager.scala:229)
	at kafka.log.LogManager.<init>(LogManager.scala:106)
	at kafka.log.LogManager$.apply(LogManager.scala:1238)
	at kafka.server.KafkaServer.startup(KafkaServer.scala:249)
	at kafka.Kafka$.main(Kafka.scala:109)
	at kafka.Kafka.main(Kafka.scala)

權限:

drwxr-xr-x  2 root root  4096 十一 26 17:22  log1
drwxr-xr-x  2 root root  4096 十一 26 17:22  log2
drwxr-xr-x  2 root root  4096 十一 26 17:22  log3

[chia7712]

@qoo332001 感謝回報。這是因為host folder不存在就會變成由docker來建立，也就變成root權限，原本的用意是使用者必須先建立好資料夾並給予權限。不過這樣可能不夠有銅鋰鋅，我會發一隻PR來處理資料夾不存在時的問題。

[chia7712]

@qoo332001 see #126