all: Add hive instance information endpoint

[marioevz]

Adds a /hive endpoint to the server API that returns an object containing information about the hive instance that is currently running.

Hive info object contents

• command: Command line used to start the hive server.
• clientFile: Contents of the file specified in --client-file if any.
• commit: Git commit used build the hive binary.
• date: Date of build of the hive binary.

[fjl]

I don't fully understand why this is a part of the simulation API. From discussion with @parithosh, I learned that this info is wanted for the purpose of displaying it in test results.

The simulation API is the endpoint for the simulator. The simulator doesn't really need to know the hive version. If hive wants to write information about itself into the output file, it can just do it.

[marioevz]

I learned that this info is wanted for the purpose of displaying it in test results.

Yes that's the only reason.

The simulation API is the endpoint for the simulator. The simulator doesn't really need to know the hive version. If hive wants to write information about itself into the output file, it can just do it.

But isn't the simulator created by hive? We don't have any other way to communicate with hive, other than doing some hacky stuff like looking at which process is using the port and then somehow get the information about the output file.

Perhaps we could look it like a way of looking for the information about the hive version that was used to create the simulator.