Further improvements in rally info

* Add more info about basic entities in rally, add samples
* Fix wrong multiline :param: handling
* Fix "rally info BenchmarkScenarios" output so that it contains
  no base classes with no scenarios
* Sort entity tables (BenchmarkScenarios/DeployEngines/...) by names
* Enable search for SLA by config option name (not only by class name)
  and print this config option name in "rally info SLA"
* Fix SLA desciption in the basic "rally info" call
* Rename "rally info DeployEngines" -> "rally info DeploymentEngines",
  but leave an alias (so that "DeployEngines" still works)
* Handle unicode bugs
* Modify the cliutils code so that it does not print traces in case of
  excessive CLI arguments
* Other cosmetic improvements

Change-Id: I2ca2b5e7f00b503a1b60d2103596ab1dfa64ac46
Closes-Bug: #1392895
Merge "Further improvements in rally info"