Change install scripts to not use force-yes

[thenor]

The install shell scripts use the flag "force-yes" which is deprecated in apt-get, but there is no other obvious or recommended substitute since we need a solution which is non-interactive (something which forces installation, but never prompts for input). "assume-yes" results in not all dependencies being installed, "allow" flags may prompt for input.
Replace all "force-yes" occurrences.

[sashko]

@thenor could you please update the status of this issue?

[thenor]

I can't find that we are using force-yes anymore so most likely this has been fixed at some point.