Move away from crypto:md5 deprecated in R16B01

crypto:md5 was deprecated by commit 7c901c9 first released in R16B01.

Main script used:
$ find . -type f -name "*.[he]rl" -exec sed -i -e "s/crypto:md5(/crypto:hash(md5, /g" {} \;
Ignore OTP version requirement for the sake of testing