Alias openwsman and openwsmand systemd services

Also create respective rc-commands: rcopenwsman, rcopenwsmand
Create server-plugin-ruby as separate RPM
Support SHA512 password encoding, use safe_cmp to prevent brute-force
attacks

SHA512 passwords needs more space than 64bytes

The runtime of strcmp depends on the string size, thus allows for
brute-force password attacks. Replace it by constant-time safe_cmp
when comparing usernames and passwords.
Prepare 2.4.6 release