Add verbosity to bcfg2 -I questions

[naapuri]

When running bcfg2 -I, the package installation questions should be more verbose. For example, now bcfg2 asks:

Would you like to install Package: screen? (y/N):

It could ask something like this:

Upgrade package 'screen' (1.2.3 => 1.2.4)? (y/N):

DOWNGRADE package 'screen' (1.2.4 => 1.2.3)? (y/N):

Re-install package 'screen' due to changed files? (List the files with 'debsums -as screen') (y/N):

Similarly, ConfigFile? installation questions could offer a choice to see a diff of the file.

OTOH, while these enhancements would be nice, there is the reporting system that should give this information anyway.

[…]

Another suggestion to the -I mode : make available a diff of the changes to commit to a config files to update.

[desai]

I have committed initial support for per-entry upgrade messages in [4d0b6a85024d10a9b72baf7b8a1da5ada6ee0f5d] (SVN r2684). We will need to instrument more drivers to provide this data, but APT and RPM are done.

[desai]

ConfigFile? support added in [46a242872523b8946e2ac48129c32f410b92f15f] (SVN r2697)

[Williamdype]

Interesting helpful bugs noticed here. This is test post ​http://xd6lfj3z.com