[conf] Set useful default colors when color is enabled
[conf] Set useful default colors when color is enabled

DNF (and YUM before it) has supported colors for representing package
transaction states for years, but it has largely remained not configured
by default.

Adding some default color settings helps drastically improve the usability
of the UI and gives DNF some nice personality.

rpm-software-management/libhif,rpm-software-management/libdnf,rpm-software-management/libhif,hughsie/libhif,rpm-software-management/libhif,hughsie/libhif,hughsie/libhif,hughsie/libhif,rpm-software-management/libdnf,rpm-software-management/libdnf,rpm-software-management/libdnf,rpm-software-management/libhif