Add setting for notebook repo to set s3 path syle access

Zeppelin allows to save notebooks to S3.We cam allow to set path style access to s3 storage using

https://docs.aws.amazon.com/AWSJavaSDK/latest/javadoc/com/amazonaws/services/s3/S3ClientOptions.Builder.html#setPathStyleAccess-boolean-

https://docs.aws.amazon.com/AWSJavaSDK/latest/javadoc/com/amazonaws/services/s3/AmazonS3Client.html#setS3ClientOptions-com.amazonaws.services.s3.S3ClientOptions-

We need to add new property ZEPPELIN_NOTEBOOK_S3_PATH_STYLE_ACCESS

Example

export ZEPPELIN_NOTEBOOK_S3_PATH_STYLE_ACCESS=true