Bug#11765888 58898: MYSQL_INSTALL_DB: NOT ALL OPTIONS DOCUMENTED

                    (EG: --DEFAULTS-FILE )

Added help message for the missing options (--no-defaults,
--defaults-file and --defaults-extra-file).

scripts/mysql_install_db.sh

@@ -46,10 +46,16 @@ Usage: $0 [OPTIONS]
   --cross-bootstrap    For internal use.  Used when building the MySQL system
                        tables on a different host than the target.
   --datadir=path       The path to the MySQL data directory.
+  --defaults-extra-file=name
+                       Read this file after the global files are read.
+
+  --defaults-file=name Only read default options from the given file name.
   --force              Causes mysql_install_db to run even if DNS does not
                        work.  In that case, grant table entries that normally
                        use hostnames will use IP addresses.
+  --help               Display this help and exit.                     
   --ldata=path         The path to the MySQL data directory. Same as --datadir.
+  --no-defaults        Don't read default options from any option file.
   --rpm                For internal use.  This option is used by RPM files
                        during the MySQL installation process.
   --skip-name-resolve  Use IP addresses rather than hostnames when creating