Silence the file-key-management plugin during mysql_install_db

This avoids printing the error
"mysqld: file-key-management-filename  is not set"
which can happen if the file-key-management pluging is statically compiled

scripts/mysql_install_db.sh

@@ -505,7 +505,7 @@ mysqld_install_cmd_line()
 {
   "$mysqld_bootstrap" $defaults $defaults_group_suffix "$mysqld_opt" --bootstrap $silent_startup\
   "--basedir=$basedir" "--datadir=$ldata" --log-warnings=0 --enforce-storage-engine="" \
-  "--plugin-dir=${plugindir}" \
+  "--plugin-dir=${plugindir}" --loose-disable-plugin-file-key-management \
   $args --max_allowed_packet=8M \
   --net_buffer_length=16K
 }