merge: Do not require interference model during topology construction (#102)

This pull request refactors the existing workload interference model in order 
to remove a dependency on it during the topology construction. With this change, 
interference domains (e.g., a single host) can be constructed independently of the 
interference profiles of virtual machines. 

## Implementation Notes :hammer_and_pick:

* Move VM interference model into compute simulator
* Remove convergence listener parameter 
* Remove FlowEngine from SimMachineContext 
* Remove timestamp parameter from SimTrace 
* Pass interference key via parameter
* Move interference logic into VmInterferenceMember 
* Prevent boxing in interference algorithm 
* Extract Random dependency from interference model
* Add separate error host state 
* Simplify constructor of SimHost 
* Make interference domain independent of profile 

## External Dependencies :four_leaf_clover:

* N/A

## Breaking API Changes :warning:

* The interface of `VmInterferenceModel` is changed. Users do not need to 
   provide a seed for the model anymore.
* A `VmInterferenceModel` should be passed via the metadata parameter of 
  `startWorkload` to enable workload interference.

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