Adjusted mysql-systemd-helper ('shutdown protected MySQL' section)
so it checks both ping response and the pid in a process list
as it can take some time till the process is terminated.
Otherwise it can lead to 'found left-over process' situation
when regular mariadb is started. (bsc#1143215)
Fixed IP resolving in mysqlinstalldb script. (bsc#1142058, bsc#1127027, MDEV-18526)