The current mysql-community-server package version 5.6.36-24.3.3 set wrong
directory access permission on /var/run/mysql (or /run/mysql). Because of that
no application can connect to the mysql server through sockets.

After installation (or at least reboot) the directory get following
permissions:
drwx------  2 mysql     mysql     60 May 11 18:55 mysql

But to access the socket file the directory permissons should be:
drwxr-xr-x  2 mysql     mysql     60 May 11 18:55 mysql

With mysql-community-server package version 5.6.35-22.1 that works fine.

Working package details:
Repository     : openSUSE-42.2-Update
Name           : mysql-community-server
Version        : 5.6.35-22.1
Arch           : x86_64
Vendor         : openSUSE


NOT working package details:
Repository     : openSUSE-Leap-42.2-Update
Name           : mysql-community-server
Version        : 5.6.36-24.3.3
Arch           : x86_64
Vendor         : openSUSE

Whether the problem also 32 bit versions concerns, I do not know.