MQTT read_table_A.pl support

[jsiddall]

This was written by Giles Godart-Brown

[hollie]

This pull request passes the Travis check, but the result is not reflected in the status above due to a change I had to do from travis-ci.org to travis-ci.com.

The actual result of the test is here: https://travis-ci.com/github/hollie/misterhouse/builds/209211100

So CI-wise, the pull request is OK to merge.

[hollie]

Hello @jsiddall,

thanks for this pull request.

Maybe a small cosmetic suggestions: in MQTT 'speak' the server is called 'broker'.

Would it make sense to keep the name of the instance in line with the commonly used term, especially in the table definition?

So instead of calling the instance MQTT_GATEWAY I think it makes sense to rename it to MQTT_BROKER.

What do you think?

Best regards,
Lieven.

[jsiddall]

I replaced all occurrences of gateway with broker and amended the commit.

[hollie]

Thank you Giles! Merging in...