galera_recovery script hard-codes the user

The user account used to start mysqld by the galera_recovery script is hard-coded, which can make it difficult to change. See the following:

$ grep "user" /usr/bin/galera_recovery

user="mysql"

  eval /usr/sbin/mysqld $cmdline_args --user=$user --wsrep_recover \

    # shows up in systemctl status output as a hint to the user.

  [ "$euid" = "0" ] && chown $user $log_file

Maybe it should use my_print_defaults to pull the user variable from configuration files instead, and only use the default if the variable isn't found?