JPAUser database field too short for SHA-512 password hashes (JAMES-1532) + Use sha1Hex methdod instead of the deprecated shaHex from o.a.c.c.d.DigestUtils (JAMES-1535)

git-svn-id: https://svn.apache.org/repos/asf/james/server/trunk@1554818 13f79535-47bb-0310-9956-ffa450edef68