mysql 5.5 may require mysql_upgrade

[Ian Monroe]

First off mysql 5.5 apparently ignores the MYSQL_HOME, which is
disappointing. The branch eean-mysql5.5.9fix addresses this.

I had to run mysql_upgrade before it would work though.
mysql_library_init just returned non-zero until I ran it, so I assume
that was the problem.

mysql_upgrade is generally not packaged with mysql embedded so this
might mean a new dependency. Would be nice if we could somehow do it
using mysql embedded. Any ideas?

Ian