Reports/templatetags: mark special hosts in grid view

Highligh additional special hosts in the grid view. Stale hosts get a
grey background and clean hosts with extra packages get a blue background.
Client: Handle ^C when in interactive mode

Signed-off-by: Sol Jerome <sol.jerome@gmail.com>
Merge branch 'more-highlights-in-gridview' of https://github.com/AlexanderS/bcfg2