Update raydp-submit (#392)

Traceback (most recent call last):
  File "<string>", line 54, in <module>
NameError: name 'os' is not defined

bin/raydp-submit

@@ -51,7 +51,7 @@ fi
 log4j_config=()
 while read line; do
   log4j_config+=($line)
-done < <(python3 -c "from raydp import versions; print(versions.SPARK_LOG4J_VERSION); 
+done < <(python3 -c "import os; from raydp import versions; print(versions.SPARK_LOG4J_VERSION); 
 print(versions.SPARK_LOG4J_CONFIG_FILE_NAME_KEY);
 print(os.getenv(\"SPARK_LOG4J_CONFIG_FILE_NAME\", versions.SPARK_LOG4J_CONFIG_FILE_NAME_DEFAULT));
 print(versions.RAY_LOG4J_VERSION);