devices: add `autopv` option to lvm2.lv to auto-discover PV #783

Job	Run time
📦 Packit config lint	1m 1s
🔍 Check JSON files for formatting consistency	28s
Python Linters	1m 25s
Shell Linters	13s
🔍 Check for valid snapshot urls	5s
Spelling	12s
	3m 24s

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