[ser2sock] Baud rate as a variable. Allows for other serial devices

[dcplaya]

Special notes for your reviewer:

Allowed me to use a Nortek zigbee/zwave device. Probably useful for other stuff too.

Checklist

[Place an '[x]' (no spaces) in all applicable fields. Please remove unrelated fields.]

• [x] Chart Version bumped
• [x] Title of the PR starts with chart name (e.g. [radarr])