shared: split random and hash utils
"nm-utils/nm-shared-utils.h" shall contain utility function without other dependencies. It is intended to be used by other projects as-is. nm_utils_random_bytes() requires getrandom() and a HAVE_GETRANDOM configure check. That makes it more cumbersome to re-use "nm-shared-utils.h", in cases where you don't care about nm_utils_random_bytes(). Split nm_utils_random_bytes() out to a separate file. Same for hash utils, which depend on nm_utils_random_bytes(). Also, hash utils will eventually be extended to use siphash24.
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