apps/cmp: improve -reqin option to read fallback public key from firs… #1240

Job	Run time
run-checker (enable-asan enable-ubsan no-shared no-asm -DOPENSSL_SMALL_FOOTPRINT)	20m 56s
run-checker (no-ct)	8m 58s
run-checker (no-dso)	8m 23s
run-checker (no-dynamic-engine)	11m 1s
run-checker (no-engine no-shared)	7m 18s
run-checker (no-err)	8m 44s
run-checker (no-filenames)	9m 54s
run-checker (enable-ubsan no-asm -DOPENSSL_SMALL_FOOTPRINT -fno-sanitize=alignment)	12m 43s
run-checker (no-module)	8m 30s
run-checker (no-ocsp)	8m 37s
run-checker (no-pinshared)	8m 29s
run-checker (no-srp)	9m 42s
run-checker (no-srtp)	9m 44s
run-checker (no-ts)	8m 33s
run-checker (enable-weak-ssl-ciphers)	10m 24s
run-checker (enable-zlib)	8m 37s
	2h 40m 33s

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