APPS/pkeyutl: improve -rawin usability and doc #1172

Job	Run time
run-checker (no-cmp)	4m 44s
run-checker (no-cms)	5m 4s
run-checker (no-dgram)	4m 42s
run-checker (no-dh)	4m 58s
run-checker (no-dtls)	4m 52s
run-checker (no-ec)	4m 9s
run-checker (no-ecx)	4m 57s
run-checker (no-http)	4m 48s
run-checker (no-legacy)	6m 36s
run-checker (no-sock)	4m 34s
run-checker (enable-ssl-trace)	5m 4s
run-checker (no-stdio)	2m 11s
run-checker (no-threads)	4m 48s
run-checker (no-thread-pool)	4m 53s
run-checker (no-default-thread-pool)	4m 56s
run-checker (no-tls)	4m 24s
run-checker (no-tls1_2)	4m 40s
run-checker (no-tls1_3)	4m 39s
run-checker (enable-trace enable-fips)	5m 15s
run-checker (no-ui)	5m 1s
run-checker (no-quic)	4m 48s
	1h 40m 3s

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