Server will however still accept shutdown without specified level; so that old
mysqladmin can still shut server down.
I would like your comments on the names of shutdown level which I chose. You
are welcome to propose better names. Please however check WL#709 before.
Reason for the names I propose is to be accurate, thus leaving possibility
for other levels which we may imagine in the future; that's why I have rejected
names like "fast", "smart", "graceful" so far. My position is that WAIT_ALL_BUFFERS
or WAIT_CRITICAL_BUFFERS say what the shutdown does, whereas for "smart", "fast" you
need to remember what it does.
This should be pushed in 4.1.3 but only after your comments.


client/mysqladmin.c:
  2nd parameter for mysql_shutdown()
include/mysql.h:
  2nd paramater for mysql_shutdown()
include/mysql_com.h:
  4 types of shutdown
libmysql/libmysql.c:
  passing the requested shutdown level
sql/sql_parse.cc:
  check for the shutdown level in dispatch_command(). Though its value is ignored for now.
tools/mysqlmanager.c:
  2nd parameter to mysql_shutdown