Inclusive language: Replace the word "master/slave" with "primary/subordinate"

[Puneethgr]

• Version of collectd: 5.12.0

Please provide additional, alternative options for the term "master/slave" with "primary/secondary" or "primary/subordinate" (while ensuring backward compatibility). It is considered as Tier-1 non-inclusive word.

Occurrences of master/slave:

1. https://github.com/collectd/collectd/blob/83a3e93f0f5b38a591a7a1a26c1def8ef9b10f1b/src/modbus.c
2. https://github.com/collectd/collectd/blob/1da3305c10c8ff9a63081284cf3d4bb0f6daffd8/src/mysql.c
3. https://github.com/collectd/collectd/blob/1da3305c10c8ff9a63081284cf3d4bb0f6daffd8/src/barometer.c
4. https://github.com/collectd/collectd/blob/fd25995a2dd31f8af286dcdf80965b264fce04bb/src/collectd.conf.in

[mrunge]

Thank you for your report. Please submit PRs to get this fixed.

[eero-t]

@Puneethgr Please provide tested PRs both to the "main" v5 and "collectd-6.0" v6 branches.

[mrunge]

I would prefer to use Primary/replica, but there may be better suggestions

[nuclearcat]

At least in modbus protocol this is part of specification, imho it will be confusing change as it wont match it anymore:
https://modbus.org/docs/Modbus_Application_Protocol_V1_1b.pdf
Same as barometer this word is part of I2C specification as well.

[leeclemens]

This could be confusing with MySQL as well, as long as they use these words - especially referencing variables or commands. e.g.

query = "SHOW subordinate STATUS";