info: make use of Tab#to_s

Closes Homebrew/homebrew#18788.

Library/Homebrew/cmd/info.rb

@@ -99,20 +99,9 @@ module Homebrew extend self
       kegs.reject! {|keg| keg.basename.to_s == '.DS_Store' }
       kegs = kegs.map {|keg| Keg.new(keg) }.sort_by {|keg| keg.version }
       kegs.each do |keg|
-        print "#{keg} (#{keg.abv})"
-        print " *" if keg.linked?
-        puts
-        tab = Tab.for_keg keg
-
-        # Intentionally print no message if this is nil because it's unknown.
-        case tab.poured_from_bottle
-        when true then puts "Poured from bottle"
-        when false then puts "Built from source"
-        end
-
-        unless tab.used_options.empty?
-          puts "  Installed with: #{tab.used_options*', '}"
-        end
+        puts "#{keg} (#{keg.abv})#{' *' if keg.linked?}"
+        tab = Tab.for_keg(keg).to_s
+        puts "  #{tab}" unless tab.empty?
       end
     else
       puts "Not installed"