reduce spacing in read-only view of system form

Buttons which live inside the system form are reduced to btn-mini which
is as small as Bootstrap allows. Read-only values are shown as plain
text instead of uneditable inputs. Also muted the label colour to avoid
the wall-of-text feeling now that everything is just unadorned text.

Bug: 1052043
Change-Id: Id5144b1e845e86974f6999cc934a9b94f8be7326