rm: implement --one-file-system and --preserve-root=all failure #979

Job	Run time
Build the fuzzers	46s
Run the fuzzers (fuzz_test, true)	2m 58s
Run the fuzzers (fuzz_date, false)	3m 8s
Run the fuzzers (fuzz_expr, true)	3m 3s
Run the fuzzers (fuzz_printf, false)	38s
Run the fuzzers (fuzz_echo, true)	1m 39s
Run the fuzzers (fuzz_seq, false)	5m 13s
Run the fuzzers (fuzz_parse_glob, true)	1m 44s
Run the fuzzers (fuzz_parse_size, true)	1m 43s
Run the fuzzers (fuzz_parse_time, true)	3m 13s
	24m 5s

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