Poor performance when UploadFolder procedure when uploading folder with 5000 files

[nikhilv]

To reproduce:

1. Create a folder with 5000 files
2. Create a project and procedure
3. Create a subprocedure call invoking EC-S3:UploadFolder
4. Specify directory from 1
5. Run Procedure

EXPECTED RESULT:
Long pole should be communication to S3.

ACTUAL RESULT:
Long pole seems to be setting properties on the Flow Server.

Initial Triage:
When uploading a folder with 5000 files, it looks like we try to do 5000 serial setProperty requests to the FlowServer.

   //set the properties
    list.each {
        item ->
            def url = "https://" + bucketName + ".s3.amazonaws.com/" + item
            System.out.println(item + "  ==>  [" + url + "]")
            commander.setProperty(propResult + "/" + item, url)
    }