decide OS target of OpenLDAP 2.5

[davidcoutadeur]

OS target:

• debian 9: may be very difficult due to the inclusion of argon2 in the core
• debian 10: ok
• debian 11: ok
• ubuntu ?

[davidcoutadeur]

decision:

• drop debian 9 support
• ubuntu: test at least ubuntu LTS (20.04)

[davidcoutadeur]

OS policy target is:

• debian 10
• debian 11
• ubuntu LTS 20.04

adding newer OS versions can be considered in the future