Added --silent option to mysql_upgrade so that one can only get errors printed
Don't write unnecessary warning about log tables during upgrade



client/mysql_upgrade.c:
  Don't print connect arguments if not using --verbose --verbose
  Added option --silent to only print errors. This options is passed to mysqlcheck.
  Write out phase names
  The 'verbose' code is a bit strange as I wanted to keep compatibility with old mysql_upgrade
client/mysqlcheck.c:
  Don't upgrade log tables (to avoid confusing warning message that they can't be locked)