Fix bkperf log directory not found (#3858)

### Motivation
When using the bkperf command `bin/bkperf journal append -j data -n 100000000 --sync true` to test the BookKeeper journal performance, it failed with the following exception
```
[0.002s][error][logging] Error opening log file '/Users/hangc/Downloads/tmp/tc/batch/ta/bookkeeper-all-4.16.0-SNAPSHOT/logs/bkperf-gc.log': No such file or directory
[0.002s][error][logging] Initialization of output 'file=/Users/hangc/Downloads/tmp/tc/batch/ta/bookkeeper-all-4.16.0-SNAPSHOT/logs/bkperf-gc.log' using options 'filecount=5,filesize=64m' failed.
Invalid -Xlog option '-Xlog:gc=info:file=/Users/hangc/Downloads/tmp/tc/batch/ta/bookkeeper-all-4.16.0-SNAPSHOT/logs/bkperf-gc.log::filecount=5,filesize=64m', see error log for details.
Error: Could not create the Java Virtual Machine.
Error: A fatal exception has occurred. Program will exit.
```

The root cause is that the `logs` directory was not created.

### Modifications
Create the `logs` directory before bkperf started.

bin/bkperf

@@ -50,6 +50,8 @@ CLI_LOG_FILE=${CLI_LOG_FILE:-"bkperf.log"}
 CLI_ROOT_LOG_LEVEL=${CLI_ROOT_LOG_LEVEL:-"INFO"}
 CLI_ROOT_LOG_APPENDER=${CLI_ROOT_LOG_APPENDER:-"CONSOLE"}
 
+mkdir -p ${CLI_LOG_DIR}
+
 # Configure the classpath
 CLI_CLASSPATH="$CLI_JAR:$CLI_CLASSPATH:$CLI_EXTRA_CLASSPATH"
 CLI_CLASSPATH="`dirname $CLI_LOG_CONF`:$CLI_CLASSPATH"