Use sed for command line parsing in rfs entrypoint for cleanup directories

[AndreKurait]

bash-5.2# RFS_COMMAND="--s3-local-dir /tmp/s3 --lucene-dir \"/tmp/my lucene dir\"" ./entrypoint.sh
RFS_COMMAND: --s3-local-dir /tmp/s3 --lucene-dir "/tmp/my lucene dir"
RFS_TARGET_USER:
RFS_TARGET_PASSWORD: <redacted>
RFS_TARGET_PASSWORD_ARN:
Will delete S3 local directory between runs: /tmp/s3
Directory /tmp/s3 has been deleted.
Will delete lucene local directory between runs: /tmp/my lucene dir
Running command --s3-local-dir /tmp/s3 --lucene-dir "/tmp/my lucene dir"