[security] jceks hadoop credential provider api

# list

hadoop credential list -provider jceks:///dir/filename.jceks

# create

hadoop credential create myalias -value 'pwd' -provider jceks:///dir/filename.jceks

hadoop credential create myalias2 -value 'pwd2' -provider jceks:///dir/filename.jceks

def getHadoopCredentail(credProviderPath="jceks:///dir/filename.jceks", pwAlias = None):

    spark = SparkSession.builder \

        .appName(appName1) \

        .enableHiveSupport() \

        .getOrCreate()

    jsc = spark.sparkContext._jsc.hadoopConfiguration()

    jsc.set("hadoop.security.credentail.provider.path", credProviderPath)

    a = jsc.getPassword(pwAlias)

    passw = ''

    for i in range(a.__len__()):

        passw = passw + str(a.__getitem__(i))

    spark.stop()

    return passw

pwd = getHadoopCredentail(pwAlias="myalias")