Datastreaming: get filewriter running for all instruments

[rerpha]

Currently the filewriter is only able to run for one instrument as the runInfo messages are pushed to per-instrument topics on kafka. to get it working for all instruments requires amalgamating all config messages into one topic (could be called ALL_runInfo)

Acceptance criteria

• Stream processor or similar has been written to aggregate all config messages from every instrument's _runInfo topic into ALL_runInfo so that it contains filewriter config messages from all instruments
• Filewriter config has been updated to point at ALL_runInfo as it's config topic and ALL_writerStatus as its status topic.
• Filewriter is therefore writing files for all instruments.

[JamesKingWork]

I'm guessing this has a points of 0 as it is datastreaming?

[rerpha]

I will update the acceptance criteria as the stream processor did not work successfully in production (more info here) and this will now be done as part of the script that fills in the missing data into the filewriter config.

[rerpha]

We are going to shelve this for now as some of the metadata isn't easy to set up in the file for all instruments. the main obstacle is that the histogram streams have to have their spectrum map IDs specified and this is different for each instrument.