Description:

When I try to start percona-server right after installation on a new server, I get an error from mysqld_pre_systemd

```
Mar 20 20:50:06 base-image.brgd.ru systemd[1]: Starting MySQL Server...
Mar 20 20:50:06 base-image.brgd.ru mysqld_pre_systemd[5050]: mktemp: failed to create file via template '/var/lib/mysql-files/install-validate-password-plugin.XXXXXX.sql': No such file or directory
Mar 20 20:50:06 base-image.brgd.ru mysqld_pre_systemd[5050]: chmod: cannot access '': No such file or directory
Mar 20 20:50:06 base-image.brgd.ru mysqld_pre_systemd[5050]: /usr/bin/mysqld_pre_systemd: line 43: : No such file or directory
Mar 20 20:50:06 base-image.brgd.ru mysqld_pre_systemd[5050]: /usr/bin/mysqld_pre_systemd: line 44: $initfile: ambiguous redirect
Mar 20 20:50:07 base-image.brgd.ru mysqld_pre_systemd[5050]: /usr/bin/mysqld_pre_systemd: line 119: 5077 Killed /usr/bin/mysqld ${instance:+--defaults-group-suffix=@$instance} --initialize --datadir="$datadir" --user=mysql --init-file="$initfile"
```

I think the reason is that the /var/lib/mysql-files directory is not created either during installation or in mysqld_pre_systemd itself, so mktemp fails with an error in this code:

```
install_validate_password_sql_file () {
local initfile
initfile="$(mktemp /var/lib/mysql-files/install-validate-password-plugin.XXXXXX.sql)"
chmod a+r "$initfile"
echo "SET @@SESSION.SQL_LOG_BIN=0;" > "$initfile"
echo "INSERT INTO mysql.component (component_id, component_group_id, component_urn) VALUES (1, 1, 'file://component_validate_password');" >> $initfile
echo $initfile
}
```

If I manually create a directory /var/lib/mysql-files, the first run is normal and then everything works fine.

Steps to reproduce:
1. Install archlinux
2. pacman -S percona-server
3. systemctl start mysqld