[Draft] feat: New datasource "boot_device" and related parsers

[qinpingli]

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Complete Description of Additions/Changes:

Detailed requirement is in RHINENG-9030.

[qinpingli]

Test result of data collection:

# cat data/insights_commands/file_-s_.dev.vda
/dev/vda: x86 boot sector; partition 1: ID=0x83, active, starthead 32, startsector 2048, 2097152 sectors; partition 2: ID=0x8e, starthead 170, startsector 2099200, 266336256 sectors, code offset 0x63

# cat meta_data/insights.specs.Specs.boot_loader_on_disk.json
{"exec_time": 0.00029015541076660156, "ser_time": 0.010828018188476562, "errors": [], "name": "insights.specs.Specs.boot_loader_on_disk", "results": {"object": {"save_as": false, "relative_path": "insights_commands/file_-s_.dev.vda", "cmd": "/usr/bin/file -s /dev/vda", "args": null, "rc": null}, "type": "insights.core.spec_factory.CommandOutputProvider"}}

[qinpingli]

@xiangce Please help review, thanks!

[qinpingli]

/hold

There is some new update for the KCS, let's hold this PR first.

[candlepin-bot]

Can one of the admins verify this patch?

[qinpingli]

Per the latest trigger logic, the parser is not needed, so I'll close it.