HSC-1124 - Mock Server to mock number of connected HCF endpoints and available applications

[irfanhabib]

The mock-server currently does the following:

1. Allows the user to configure a specific number of connected endpoints.
2. Number of apps available on each endpoint can be randomly configured between a min/max value or endpoints can have a fixed number of apps.
3. Requires a portal-proxy configured with an HCF. It proxies requests the service doesn't mock to the portal-proxy. These include: authentication requests, stats request (in case the ID of a running application has been specified).

[irfanhabib]

@nwmac Can you test this?

[sean-sq-chen]

Code looks great! One minor thing, we have been using a convention that having a mock file for x.js using the name x.mock.js and put it in the same folder as x.js. It is possible to follow the convention for this PR?

[nwmac]

I guess this is a different kind of mock to the .mock files - we should think about naming and folder location for this.