SCE-324: Snap session integrated with experiment [2/3]  (#100)
SCE-324: Snap session integrated with experiment [2/3]  (#100)

* SCE-324: Snap session integrated with experiment [2/3]

- Load Generator does not parse output and it's not blocking.
- Load Generator Now it returns Task handle.
- Swan is not aware of SLI results from phases. (Tuning is exception)
- Refactored session test to be more readable.
- Moved Sensitivity Init to new Init method (in Run).
- Moved from Init to New in Experiment constructor.
- Added TODOs for places where snap session should be.
- Fixed errors with not properly switch from `Task` to `TaskHandle`

Tested:
- make unit_test
- make integration_test
- go run experiment/memcached/baseline_local/memcached.go

Signed-off-by: Bartlomiej Plotka <d28ccf02bb606fd82c591a2c44ef125de4b52a71@intel.com>

* Added missed mock files.

Signed-off-by: Bartlomiej Plotka <d28ccf02bb606fd82c591a2c44ef125de4b52a71@intel.com>

* Addressed issues.

Signed-off-by: Bartlomiej Plotka <d28ccf02bb606fd82c591a2c44ef125de4b52a71@intel.com>

intelsdi-x/swan,intelsdi-x/swan,intelsdi-x/swan