Set client max/min protocol via environmantal variables

[Mikhail Novosyolov]

I've made a patch trying to allow setting 'client min protocol' and 
'client max protocol' via an environmental variable.
Samba 4.9.4 with this patch builds OK, but I don't see any effect from 
e.g. SMB_CLIENT_MAX_PROTOCOL=NT1, even when setting this in systemd unit 
smb.service

What have I done wrong?

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