got scripts to benchmark network from Gionatan Danti
Router_performancetest script big update

This updates the following:
- adds options t and f (t is target and f remote file)
- updates usage message
- changes resultsdir to something with a date
- adds messages to each test
- tests if all testtools are available
- moves sleep to drop_cache function to avoid duplicate code
- changes order of tests to comply with tests in article

TODO:
- I want to apend all results in one file
- I want a third param to allow the user to give each test a name that
  will be used in the filename.