lsblk parser is not really necessary the lsblk has -J option

[braindevices]

I found some of my colleagues actually using jc to parse lsblk output. Actually this is not necessary at all

-J, --json
Use JSON output format. It's strongly recommended to use --output and also --tree if necessary.

This option is introduced 7 years ago. I am pretty sure almost all the distro has it already. I suggest we should deprecate this parser or at least add some warning to tell users to use -J directly.

[kellyjonbrazil]

I like the idea - the only thing is that it looks like Centos7 came with lsblk v2.23.2, which doesn't have this option. Since Centos7 is still running on lots of servers I think it might be premature to issue any deprecation warnings. I'm not against the idea, though.