* saving log for each app type support
* colt library is used for poisson distribution
* Setting file structure is updated
* some bug fixes are applied
* new abstract functions are added to network manager for another
experimental study
1- finding which device to offlod is decided in edge orchestrator
(EdgeOrchestrator), instead of deciding while generating task
(LoadGeneratorModel)
2- file logging option is now read from config file
3- minor modification on the network delay calculation
1- simulation scenarios are defined in config file instead of static
enumarations
2- defining multiple edge orchestrator policy in config file support is
added
