have sa-update also pass the version of SA installed via user-agent header
have sa-update also pass the version of SA installed via user-agent header

git-svn-id: e9fe9b84e32fc5e57b7d09c40cd78b14ea28ed71@430982 13f79535-47bb-0310-9956-ffa450edef68

apache/spamassassin,apache/spamassassin,apache/spamassassin,apache/spamassassin,apache/spamassassin