Load test batch-file-ingest sample with volume services on PCF

[sabbyanandan]

As a developer, I'd like to load test the file-ingest sample with large files of size >2G or more each.

child of #66

[chrisjs]

rather than add extra network overhead d/ling a file from somewhere, i deployed an application that was bound to the NFS service, SSH'ed into the application container and used dd to create a ~3GB file on the target mount dir. network configuration and so on would likely play a factor in the below stats, one would likely optimize for NFS. the result of this test is:

3252952+0 records in
3252952+0 records out
3331022848 bytes (3.3 GB) copied, 1267.14 s, 2.6 MB/s

real	21m7.141s
user	0m8.240s
sys	1m2.672s