document & sample improvement

[ywang19]

Need improve document & samples to resolve a few confusions:

1. why disk space is not release even object is deleted?
   --> need some explanations in document, and it should cover swift and amplistor.
2. the diagrams in user guide are specific to swift, need generic diagrams for both swift and amplistor.
   --> need some generic diagrams and terms to cover different storage system in document.
3. how can save the files from being automatically cleaned up at the end of the test run? need samples to demostrate them.
   --> need some samples to show how to reuse data across test runs.
4. how to install COSBench and have it start automatically after a reboot?
   --> need FAQ to show how to auto start COSBench.
5. why there are errors at war deployment?
   --> It's an known issue, but doesn't affect real functionality. Actually, it is caused by osgi bundle loading mechanism.
6. in ipv6 env, socket can not bind, how to resolve it?
   --> it's a tomcat related issue, one workaround is to set the ip address in tomcat server configuration file, need FAQ to show it.
7. why the parameter list shown on UI is a bit different from xml file?
   --> need explanation in document.

[ywang19]

1. are there any real-world workload available?
   --> need more samples for real-world workloads, this is a long term work.