Updated simulator and aggregator to be consistent with the discussion on FQDNs and service function instances

See 

https://gitlab.it-innovation.soton.ac.uk/FLAME/flame-clmc/blob/mediaComponentConfig/docs/monitoring.md#user-content-configuration-status-modelling-and-monitoring

for documentation

Also fixes field validation for unspecified metric data

Refactors simulator based fixtures in conftest and embeds MC config state into simulation boot sequence

Restructure pytest package to use correct module names and provide setup.py to build a python package distribution, needed to more effectively reuse tests in the platform project build/test process

* Creates an measurement table called mediaComponentConfig
* Simulates 'stopped' and 'running' states for Apache endpoints in simulator
* Creates a pytest case in which configuration state changes are queried