Clean script directory.

* Fix host availibility test so that it works on hosts without JAVA 7
* Separate testing code from node checking and listing code
* Make tests agnostic to currect working directory
* Delete obsolete communication tests
* Add argument handling to build_and_deploy and gen_config_files
* Update README files
* Fix upload-libs-to-planet-lab by making it update only when size has changed
  (since there is timezone discrepancy) and
  Update it with option handling and new docs.

Change-Id: I1b05db63e7222aa0e79a2f27c12f1f9cdbb933fc